Does anyone know if a '76 280Z Hood is a direct replacement for a '71 240?

Any other body panels changeable?

More or less. The factory listed different part numbers for those two, but the differences are minor. In fact, most aftermarket hoods are the same for '70-76. So yes, it will bolt on to the older car fine.

The '77-78 hoods fit also, but have the hood vents on them. Front fenders are pretty much the same for all years, '70-78. Doors have differences both internally and in latch hardware, it may be simplest to stay with the correct ones there. I believe there were three different tailgates - Series 1 with vents, other 240Z with single strut on the the left side, and the rest with two struts. These are also more or less bolt-on interchangeable if you allow for the vent and support strut differences.

Thanks Arne. I found someone locally selling used hoods and I am in desperate need of one.

I've got a 77 hood on my 72 240z