Are all four coil springs interchangable between a 73 240z and a 77 280z? If not, any suggestions where to get stock springs for a 73 240z reasonably? My 73 was lowered and I want to get it back to stock height.

The coil springs are not interchangeable between the 240 and 280. The 280 springs are longer and also stiffer. You would have to cut the 280 springs to get the car back down to it original ride height, and that would be a guessing game on how much to cut.

The springs are interchangeable between all the 240's and the early 260 with the small bumpers though. The late 260 (big bumpers, FI) and the 280's all have a larger diameter strut housing and it is longer by approx. 2 inches.

You could probably find a set here by posting in the wanted section of the classifieds, someone somewhere is probably changing their stock springs and may be willing to sell the set. Plus there are quite of few who have a stock pile of extra parts, I'm one of them, but right now I don't have a set of springs to offer you. If you can't find a set, get back to me in a few weeks and I'll see what I can do.

I would be interested in those shorter springs when you have them off. In fact if I could figure out how to trade I have a '73 240z. That is if the springs you have are the right ones.