This line of turntables was made in 1981. Technics made belt drive ("B"), direct drive ("D"), and Quartz ("Q") versions.
Of tonearm types, the series had:
101: fully manual - user does everything
202: automatic arm return only
303: fully automatic
Do the math and you get SL-B101, SL-B202, SL-B303, SL-D202, & SL-D303, SL-Q202, and SL-Q303.
I have one belt drive and one direct drive, and the covers freely interchange. Not sure about models from other years.