The German Shop has got both aftermarket and NOS factory parts, a bit more pricey but another option. Also 62mm rings are a common size, Hastings and a number of Japanese suppliers may have a correct replacement ring.
www.z1300.de/
Rings are the same between the KZ and the voyager.
Mic your bores, I though I was good for a simple hone job, bud discovered a couple of cinders had some hour glass going on. Someone had honed it before and got lazy with the drill at the top.... Make sure your bores are solid before you re-ring.