1st and 2nd wheels on 3rd gen
 

i found some wheels that are 18x10 that i like.
the seller says that they only fit 67 to 81 camaros.
i was wondering if anyone know the difference beween those and 3rd gen wheel specs.
i know i can always get spacer which is not a problem.

the only specs i got was 18x10 with 19 mm offset.

87 iroc

Those should fit on the rear as typically up to a 5.5" back space will clear with disc brakes & 6" with drums. Your wheels are approximately 4-3/4" backspace which means it should clear the inside wheelwell, but will likely be at the outer edge of the quarters. Probably not an optimal setup for clearance.

They will not fit the front as anything over a 9.5" wheel generally hits in the front without major surgery even when the wheel has 5.5" B.S.

I spent a lot of time trying to fit different wheel to my Formula & there aren't many that have the proper backspace along with the proper hub clearance for the front. My suggestion would be to consider another wheel.