Old thread, but posting here as I see others looking for same info. Here are the official codes from Toyota for bumper, trim, moulding, etc.
For those with the special 8R3 (Gray Blue Metallic aka Pacific Blue Metallic) paint color, make note of the special UCAA1 bumper colors. See attached
We use the OEM one on restos. Beware they are pricey for what they are. But if you're looking to try one before committing etc, we lhave found success with these: EVIL ENERGY Fuel Check Valve One Way Inline Non Return Diesel Gasoline - https://www.ievilenergy.com/products/fuel-check-valve
Great questions. Ours are correct for '75-80 40 series, but will fit those other years listed. However, the nut thats correct for 08/1980+ was the 'bolt head' style that was used all the way thru ~'92 3FE here in USA. Pictured below is the bolt/hex head style. Personally, like the dome...