There are some little plug looking things. I think they're called barrel clips. They have them in the help section in the parts stores. You push them into the holes, and the pins on the engines push into them and pinch onto the posts. They work great and save the hassel of having to put the nuts on the inside of the fender. THe emblems can come off with them, but you really have to pull on the emblem to get them off. Make sure the clips will fit the post sluggly before putting them in the fender. They are a pain to get back out.