"talbot horizon" 48mm pistons and "talbot simca" 44mm pistons are bolt on calipers on beetle spindle. There are 3 different talbot horizon models with different pads which can bolt on (small, medium and large pad) they become hard to find because these car were product during 70's 80's. The main issue with these calipers is there weight, especially the 48mm, whereas the 44mm are very similar to bug caliper and have the small pads (rabbit mk1 pad) which are the better one because "less blocking wheels" and not "singing" when you curb slowly.
Here you can see the Girling ones which have 48mm piston but medium pads
Ate's 44mm small pad
Bendix 48mm large pads