This conversion information provided by 'dave76' of the XLForum - http://xlforum.net/forums/showthread.php?t=2082025

I finally found time to finish this project. Took it for a ride (freezing weather - but I enjoyed it). The belt is definitely quieter and smoother than the chain configuration.

A standard 1991 belt drive sprocket cover will be needed, the left middle bolt is no longer used so I just used a short faux bolt and nut.

The belt I used was 1-1/8“ wide with 128 teeth.

Puts the adjuster in the middle. Took it for a ride and froze but I enjoyed it, belt is definitely quieter and smooth.

The main part numbers that I was able to find were:

40271-89 – Front drive pulley 27 tooth

40258-89 – Rear driven pulley (pulley only not the chrome guide cover).

40273-89 – Rear pulley chrome guide cover.

I cannot find the number for the top or bottom belt guards. I sourced my rear pulley off eBay, the front came from V-Twin (Taiwan teddy).

40022-91 – Drive Belt (Standard Harley 1-1/8 x 128 teeth).

image1 Belt guard top, 4 speed chain guard bottom

image2

image3 This is the counter bore bit needed to recess the engine case bolt 3/16” more

image4

image5 This top bolt was used in place of the large 7/16 standoff stud

image6 This is the bolt that needs to be counter bored to clear the big belt sprocket.