This 21inch wheel, natural speedometer drive kit includes drive and adapter ring to utilize a 2240:60 speedometer on FXWG dual disc and FLH single disc.
The inner diameter of the drive ring that mounts to the wheel is 3/4". The spacer measures 1.127" inner diameter, 0.748" outer diameter, and 0.156" thick. The overall wide is 1-3/8", the top pipe is 3/4" and the overall height is 2-3/8".
1973-80 FXWG dual disc and FLH, single disc.