While doing the engine swap I noticed that my shifter boots were ripped, lower boot was leaking oil from the turret t00. So below are some details and photos of the entire process.
The part numbers for my 1990 MX-5 are:
- lower boot - M514-17-480A
- upper boot - NA01-64-481B
Had some troubles finding the lower boot though, fortunately there is an alternative part no. M513-17-480A which you can use too.
Photo on left shows the damaged lower boot, then next photo is the lower boot removed. Take this chance to check your turret oil level and fill up if needed. Becareful not to overfill or oil will be pushed out once you put the shifter back in.