I have Amiot car on my Venezia:
Traveller Car w/ Triple Toggles: AMI 32B-13D:
Traveller Car for Amiot 32mm RCB Track has Delrin Ball Bearings and Three pivoting Toggles for attachment to mainsheet blocks. Car has beckets and 2 control sheaves for up to 5/16" (8mm) line, providing up to a 3-1 control purchase
. Triple Toggle Car is 12" (300mm) long
with a maximum width of 3 1/16" (78mm).
btw: you can get the hd delrin balls way cheaper at McMaster-Carr... been there, done that.