The original types from the early w123 were modified by later types. Both will fit any w123.

Bone yards are good sources.
They can be rebuilt by parts from failed units.

I keep spares in storage.

Yes grease them up.

__________________
1979 300D 220 K miles
1995 C280 109 K miles
1992 Cadillac Eldorado Touring Coupe 57K miles SOLD
********************
1979 240D 140Kmiles (bought for parents) *SOLD.
SAN FRANCISCO/(*San Diego)
1989 300SE 148 K miles *SOLD