it's called "well tempered classic arm upgrade"
a new black platter and black arm.
i was on a trip to California around 1997 and collect it directly from their office in Palo alto.
with instruction how to mount it,
i did the mounting for the original and for the upgrading.
i am not quiet sure i understand your meaning of "distance from pivot axis to stylus".
as i said , the headshell which the cartidge mounted on has the option to rotate the cartridge.
so every different angle will give a different distance from the pivot to the stylus.
if there only an option here to upload photos .
here there are some pics.
https://www.google.com/search?q=well+tempered+classic+upgraded+arm+photos&rlz=1C1AVUC_enIL798IL7...