Hey Wingnut, i am currently in the final design phase for a rear swingout tire rack for the explorer. to my knowledge the rack will work with both 91-94 and later models with only a slight change in the bracket here at the shop. if you like i will add you to the list of interested parties, which will get an e-mail as soon as the product is for sale. if this sounds good to you please e-mail me at dodgerr@hotmail.com
and i will be glad to add you to the list. and yes it is designed to retain the factory bumper if you look in general explorations there is a post describing the rack in greater detail.
dodger