The VEX products are very high quality. I would expect them to very rarely fail and take years to wear out.
Yeah appears they have no official distribution outside the USA. @Anubis @ApexBoards would either of you stock some VEX pulleys?
60T x 18mm Wide VersaPulley Kit (HTD 5mm, VersaKeys) (217-3200).step (7.1 MB)
60T x 7mm Wide VersaPulley Slice (HTD 5mm, VersaKeys) (217-3249).step (3.7 MB)
rehosting files for convenience