Hello I'm new here and have a question about plastics. So I have a 1985 pw50 and just purchased some used plastics, seat and tank off of ebay and they don't seem to fit the tank seems like it it to wide where it sits on the frame and it's like the coil is in the way. A part of the plastic sits on top of the coil. I don't know what year these parts are but they are not old. I thought all pw 50 parts were interchangeable from 83 up. If anybody has any idea what I am talking about I could use some advice thanks.