I used the same rack on my 1967 Beetle that I used on my A1 Rabbits.
It bolted to the bumper. It had a removable bike holder with two
brackets that the bike arm attached to. My Dad had a similar thing for
his square tube camping trailer. So you do not get the fancy wheel
clamp rack but it held my bikes just fine for years. I am sure if you
are just doing a 2 bike rack with an 1.25" rack you could get a
receiver tube bolted to the bumper. Just do not use it to pull
anything. If it was me (a trailer hitch store would never do it for
liability reasons) I might buy the receiver tube for $10, go to my
steel pile and get a piece of 3/16 plate, weld the plate to the
receiver tube, bolt it to the bottom of the bumper with two bolts.
Just to hold bikes it will be safe. I am a fan of Nylock nuts.

If you were in Atlanta you could look in my garage and decide if you
want any of my old racks. Or you could send me an email and I could
send you a picture of what I used to use.