Thanks Brian, Forgot to mention I'm in the UK so they're a great fall back if I can't get anything suitable over here. What's most intriguing me is actually what the differences are between such similar parts, if any at all! It's for a bike I hope to keep running for a while - I built it up a month ago and been commuting on it nearly everyday - racked up just shy of 350 miles in that time. It's going to clock up miles and wear quickly so knowing what modern parts are a replacement is also a bit less unnerving than relying on sourcing NOS parts when something goes wrong.