Hard to see from the pics, but plate rivets look ball headed? However, that could just be light refracting in the pic, very hard to see. If they are factory they should be conical with a flat top. Not to say that means anything, many owners choose to remove, or re-rivet their plates, (not on my cool list of things to do, but it happens). I'd have a look at that, and check out the chassis number for a match, (and gts loom etc).