Unless you seek originality, there is space in Henrys to put a variety of motors in. As noted, there’s a few different ones originally. If you have some rubbers and motors from other machines, you can play around and find a set up that’s a snug fit.
If you don’t have some rubbers and motors from other machines, your local vacuum shop will have. They’ve probably seen all the variants and know what fits what.
That said, someone here may have one.