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You and I seem to be doing the same jobs at the same time, my seat belt kit should be here in a couple of days. There should be a dedicated seat belt mounting hole near where you have mounted, it has the proper reinforcement to handle an impact, where you have it I think it is just sheet metal and not strong enough. Also the home-depot bracket doesn't have the strength for the job, there should have been a bracket in the kit that would work with the Datsun mounting point. Here is the proper mounting point on the D/S on a 72/240z.

I agree that using the OEM mounting points is the only way to go. Many times over the years I have seen where ill advised shade tree mechanics have mounted seat belts and even seats to nothing more than the unreinforced sheet metal of the floorpan. In the event of a crash, the bolts will pull through, even when using large diameter washers to “spread the load”. Automotive manufacturers engineer and design for safety. Circumventing the original design is asking for disaster.

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Hello all, I would like to do a little advertising for this channel here. One of my Z friends is restoring a 240Z and has a very special way of documenting it. I think you will all be very interested and it is super relaxing to watch. In general, this is a very exciting channel!

5/71 240Z. Bought a pair of Corbeau GTS 2 seats from MSA, got their recommended retractable seat belt kits as well. https://www.thezstore.com/product/5882/seat-belt-retractable-lap-shoulder-both-sides-70-73-240z Turns out that these are from Retrobelt.com and the instructions are really superficial. Bag of misc fasteners, brackets, etc was provided for the DIYer. MSA said to contact Retrobelt, who declined to provide any further instructions, citing liability concerns. The seat belt rewind mechanism mounting was my concern. Images show it being mounted to the tool box walls or drilling a new hole in the floor. By looking around, found a nasty rubber plug that sealed the interior from the road. Removed it to find a clear path to the underside. Got a L bracket from Home Depot, drilled to suit for M12 holes 70mm from each end, no cutting required. Used a M12-18mm to fasten the rewinder to the bracket, then a M12-60mm to fasten the bracket to the floor. Didn't have to cut anything in the interior, floor mat covers the bracket. Seat slides all the way aft & reclines fully w/o interference from the rewinder. Tested this on the passenger side, now for the driver's side. Critique my installation.

@grannyknot makes some great points. I used a seatbelt system similar to the one MSA sells for many years in my 240Z, but when I changed out the old seat belts in my 260Z, I went with the Wesco Performance Roadster belts (https://www.wescoperformance.com/noname.html). @jfa.series1 found them independently of my posts on them. You mount the retractor on the upper mounting point. While I understand you have already purchased the MSA belts, sometimes you have to absorb the sunk costs and move on.

Jarnved is in Denmark, In europe we had the 240z with original 5 speed gearbox! (Fs5C71 A or later B ) I once had a 240z original Dutch car (Netherlands) and it had the orig 5 speed standard. (Fs5C71B) That gearbox (and diff! 3,9:1 ) is now under my usa spec 240z. (got the orig parts as spares on the attic)

Did it originally come with the 5-Speed...? My '73 did not. If I had to do the restoration over, I would have left the original 4-Speed intact as well as the original engine. I would never sell either, so I can still swap both back in for a true "numbers matching" car. Until then, I will drive it and enjoy it.

I want my car to be original.

Looking so very good Charles! You are clearly the bulldog clip king of your neighborhood!!!

No problem, the 3.54 rear end will give you a little more go, faster off the line but not much compared to the stock 3.36 ratio.

To your point - this thing was literally paper thin in areas - probably why the do not touch sign was on it - and I was shocked how much it sold for 6 year ago!! But never underestimate the power of of having will and skill! If the OP can do metalwork to a high standard then a tonne of cost is saved.