Here is a size 138 push in main jet to fit a Dellorto si type carb.
VESPA PX DELLORTO TYPE PUSH IN SI MAIN JET SIZE 102
VESPA PX DELLORTO TYPE PUSH IN SI MAIN JET SIZE 100
VESPA PX DELLORTO TYPE PUSH IN SI MAIN JET SIZE 140
VESPA PX DELLORTO TYPE PUSH IN SI MAIN JET SIZE 118
VESPA PX DELLORTO TYPE PUSH IN SI MAIN JET SIZE 96
VESPA PX DELLORTO TYPE PUSH IN SI MAIN JET SIZE 111
