Quaife catalogue states its for 1994 onwards while FM says/e mailed that any year and recomends 1995 syncros for the re-bulid.
My box is 1992 and the 2nd gear (part 17.250 has a intergated cone) and a seperate syncro (part 17.265). The Quaife 2nd has no intergarated cone and looks the same as the 17.250 2nd gear from a 1994 with a 17-26Y syncro. This is based on looking at all the tec manuals on www.miata.net
The main and lay shafts are the same part numbers across the years 1990 - 2000 except the lay shafts on the early boxes 1990 - April 1995 has a circlip while the Quaife has no provision for one to be fitted.
The the questions are does anyone know if FM are right;
Can the later 17-26Y syncro be reto fitted to the earlier box.
(The rest of the syncro seem to be the same?)
Is the Circlip essential and are there any other differences I need to know about.
Anybody had similar issues.
Or should I simply go and find a 1995 to 1998.