I replaced the vr on a an 87 sportster for a friend a few years ago and i am pretty sure it was a different unit from my 93 sportster part number for the 93 regulator is 74523-92 so new part for 92
however the part number 74523 has variations of 84, 84a, and 84t that may be the correct one for your bike i just do not have a parts list for that year bike
Brian