are these the seat spacers? when I removed the seats one spacer was on top of the seat bracket, the other was screwed under the nut and washer. can I put both spacers above the seat bracket to raise the seat? is that what it's for?

Yes...that's your option...the older you get the more valuable they become!!

Yes...that's your option...the older you get the more valuable they become!!

Hahahaha!!!! Love it.

You can play with the number of spacers at the front and rear to change the angle of the seat bottom to suit your tush. Try different combos to see what you like best. Any spacers not used on top of the rail should be installed under the rail so as not to lose them.

im trying to tighten the rear left nut on  the driver and the rear right nut on the Passenger seat on my 1972 240z  but it seem useless, All the other 3 nuts of each seat are tight and have their plastic spacer also. Could the nut be damaged or am i missing something here? I have attached some pictures as reference. The 4 plastic nuts must be tight. However, this is not happening with these 2 nuts. Anyone?

Edited April 19, 20196 yr by jalexquijano

Anyone???

Although the plastic spacers are threaded, they are not intended to actually secure the seat mount bolt to the floor bracket - that is the job for a metal washer and nut.  The spacers are threaded more as a convenience to keep them in place on the shaft of the rail bolt.  If the metal nut won't tighten, then something is damaged - either the threads on the nut or on the rail bolt.

I thought it only had a plastic circular washer and a plastic nut fastened to the bolt. Let me see if i can take a closer picture of what i have there.

Which metal nut? All i see is a plastic washer and a plastic nut.

You'll need to look at the interior section of a FSM for the p/ns, this is what i found with a quick google.com search.

maybe this one, I can't remember if mine reclines or I turn a knob?  If it is it looks like p/n 4.  https://www.ebay.com/i/273616919573?chn=ps

http://www.carpartsmanual.com/datsun/Z-1969-1978/body-240z/seat-slide/type-1-adjuster-seat

I took some aditional pictures and found out there are some nuts under