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Just did an 86, don't recall double plate, does it have a brake mount on the lower arms running to the drops?

from my understanding the frames were the same on all years even up to the early 90's. The only differences is the pro's had 990's and that seat mass brace. some had 1 plate, some had 2, some were boxed and some had 3 sides only.. i gues some years did it differently. my 92 has 3 sides, the front is open and it's stamped dyno just like yours, the rest of the frame is just like the 80's versions.