[Ford-ferguson] 1-3/8" splined shaft belt pulley

[Jim Peck @Yahoo]

This source lists two different 1-3/8" belt pulleys. 

MF13-900  Belt Pulley Assy (35-135)  
MF13-901  Belt Pulley Assy (Heavy Duty 240+) 

http://www.thevintagetractorcompany.co.uk/tractor%20parts.htm#pto

[Buckies]yes
[jamesgpeck]Was the  adapter kit to reduce a 1-3/8" diameter PTO shaft to 1-1/8"  diameter shaft an  aftermarket item or available
through  Massey Ferguson?