Where to get Trailer Hitch for urS4

[James Dupree]

I am looking for a trailer hitch for my (new to me) 93 S4. I want to use it for a bicycle rack so I need a receiver type hitch although I don't care about the load capacity because I won't be towing with it. I could actually modify a fixed ball type hitch to work if I can find one .
I found a couple of listings for 92 thru 97 100/A6 but they specifically said "not for turbo". Anyone know why a hitch that fits a 92-97100/A6 would not fit a 93 S4?
TIA
Jim