welcome!
not sure how many are around, not a lot on this forum i know that. spares are a problem for the 16 as it getting on a bit now. wemoto do a few bits for them and apex. (sorry andy) apart from that its e bay
andy can do you some nice hell brake lines at a good price.
for pistons and rings you can use MC28 parts and i think andy can supply them as well.
best of luck with the rebuild, just ask if you need to know anything.