well if stock, 81-84 westy caddy = westy caddy.. different then non westy cars. aka german aka jetta, cabby, rocco of 81-84 is different..
6 port... means NOTHING.. originally they were 4.. since brake light switch on pedal vs german on master... but replacements came in 4 or 6 versions... 84ish german versions moved the switch to pedals around same time they went donut/trunk floor change..
pic of master by booster to determine which you have.. how 2 mount are different...
booster, pedals, master are all different... german vs 81-84 westy... if someone swapped any of it.. as matched parts = my not knowing what you have... aka 5 speed to auto swap.. brooken booster so on...
personally id find find german pedals, booster and master since replacement westy masters suck arss on how the bottle mounts.. they changed the grommet design so seem to leak brake fluid between bottle and master... and me not found a cure...