I've run both cars too, found that I had to tinker with the BX a lot to get it to work.
You might find that getting a BX tricky though as it was replaced by the BC then the Bmax, plus availability of rims spares is gonna be an issue.
With the B44, although it's been replaced by the B44.1 you shouldn't have a problem with getting spares & the rims have carried over.
MikeP
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