Mounting for what 250 and 400 are the same in years 80-82 same rolling shell 175 is different smaller seat side panels etc.
What are you trying to do I have a pe400 in 1982 pe 175 roller not a lot of room though.
The early stuff has a bit more room there's always something though if you are going to put a big motor in a 175 rear wheel needs to be changed 175 swingarm is different to 250 400 as well, thanks Michael.