They were the upgrade of choice for Paso 750 or Nuovo Sports.
Had pumpers on many bikes from R90S, 900SS 40's to 36's on Pantahs to Reno Leoni's 38's on my Paso 750 Limited. All worked great straight "out of the box" although I leaned the slides a hair on my 600 SL's. You just have to remember that the pilot screw works backwards.
LUV that accelerator pump!