Saves having to extract the upper bushing from the stock assembly I will see if i can find a link to a supplier of these shifters off ebay so they. It helps, too, to smear the upper and lower parts of the shifter ball with chassis lube.
IRP Miata Short Shifter Vs OEM Mazda Shifter - YouTube
Complete miata short shifter fit guide covering na/nb/nc/nf generations, oem vs
Cravenspeed short shifter install guide for nd miata explains how to upgrade your shift assembly for reduced throw and a more precise shifting feel.
Take the shifter assembly and gently guide it straight down into the transmission The plastic bushing on end of the shifter should slide easily into the cup in the shift turret and the shifter ball should rest on top. The installation will be very similar for every miata with the removal of the center. I've seen multiple complaints about the nvh of these complete replacement billet shifters
Unfortunately it's one of those things where you can't find out if it's worth the downsides. I prefer this style of shifter as it is a 2 piece shaft so you can choose whether you want a mild short throw or an extremely short throw
