Mars hasn't done a bill upgrade for the VFM series in at least 15 years but Pyramid at one time made a replacement board for it but I don't think they even do that anymore. That said Betson has a Pittsburgh office that could probably do the belt replacement for you.
It looks like Capital vending has the PTI boards in stock: https://www.capitalvending.com/1166.html but for that price just buy an AE2600 used.
Youtube video if you want to buy the belt kit and change them yourself: