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If you are using a K&N air filter you can go to their site and get air flow specs for their filters by the square inch. For other brands of filter the flow might be different.

Original Nissan hood bumpers still available here: https://zcardepot.com/exterior/bumper/hood-bumper-stop-adj-oem.html

M6 X 1.0 thread size

https://zcardepot.com/fuel/gas-tank/fuel-tank-rubber-strap-isolators-240z-260z-280z-70-78.html?search=fuel+tank

Great pattern part! Make sure someone gets all the specs on that before you use it!!!

Might be a good idea to remove that metal "filter" (could be clogged) that is attached to the pump (if possible) and just put a barb on there and run the separate clear fuel filter alone.

Chrome flat bullet style looks good

I am showing (2) M10 X 45 and (2) M8 X 20 per ball joint.

Is this the part your looking for? https://zcardepot.com/suspension/rear-suspension/rear-transverse-link-brace-stainless-240z-260z-280z.html These brackets are prone to cracking at the bend. I welded mine up, but a gusset would be a good idea too.

Here are the washers in stainless steel: https://zcardepot.com/suspension/rear-suspension/lower-control-arm-rear-stainless-washer-240z-280z.html

The New Nissan wood shift knob does not match up to the originals very well. Here is one I bought that is very nice quality and available for 4 & 5-speed. Might even have the inserts avail separately. https://zcardepot.com/driveline/transmission/shift-knob-wood-4-and-5-speed-510.html?search=shift+knob

OEM switch cant be beat, $36.99. But I have had good luck with aftermarket also. https://zcardepot.com/electrical/switches-and-relays/reverse-back-up-light-switch-oem.html?search=reverse+switch