82 GS850 frame and fork question

[NotAnOldFart_gs850]

Does anyone know if a 1980 gs850 frame is the same as the 82 gs850? I the only thing that i can see that is different is the rear where the seat mounts, is this correct. What I am trying to do is convert my gs to a cafe racer and I want to modify the rear of the bike. A guy close to me has a 80 gs850 frame for sale. I don't want to modify my current frame bc there isn't anything wrong with my bike and I want to take some time with working on the frame so when its complete I can transfer everything over. Another question i have, does anyone know what forks would fit my frame? Like gsxr, other gs models and what years. Thank u anyone who can help!

[Steve]

Can't help with the forks question, but there are differences in the frames.

Besides the seat mount, the gas tank mount and rear footpegs/muffler mount are different.

.