Hi Frank . . .
I am running the Buffalo Conversion. I believe that the Filling Station is still reselling them through their catalog. I see that parts123 site still has the photo online:
parts123.comOf course the old access plug isn't big enough, so you need to create an access hatch in floor for servicing.
regards,
stock49
PS the conversion assumes the 4 top screw style master cylinder. Not sure what year it was introduced. You might need to find a newer style core.