They have an excellant customer service department that could address
all your questions. You can email or call their 800 number.

I don't know if they're the same, but I have at least 4 extra wheels
for my 1979 300SD, 1981 300SD, and 1982 300SD.  All of the wheels are
the same, and take either 195 RR 14 70 or 205 R 70 tires.  All have
the star caps.

Here is my previous post on what I have:

FS: MERCEDES Classic 300 D Turbo Diesel, 1982. Best running and
fastest TurboDiesel I ‘ve had, and I've had 3. Only 170K miles (low
for these cars!).  White with very good interior. Needs some body
work, but very little rust. Only $1250! (I have about $2000 in it.) I
also have a complete parts car for anything extra that might be
needed.  Located in New Smyrna Beach, FL (near Daytona Beach/Orlando).
Call Dave @ 386-235-4276; or e-mail dazmail@bigfoot.com.

Extra Details:

Body is series 123. Extra wheels available, since I have a 1981 300 SD
(series 126) in very good shape I am using as a parts car (only thing
major wrong with it is the crankshaft, which won't turn the belts
anymore.)  Also have 4 good extra tires (195-14s). The motor was
rebuilt in 2000.  Since then I bought plenty of brand new parts for
it, which should fit on the 300 D or other 123, 116, or 126 series,
including brake calipers, motor mounts, motor shocks, oil lines,
starter, etc.  300SD body parts are excellent, gold paint.  

I also have major very good body and interior parts, including
windshield wiper motor, mirrors, doors, trunk lid and hood, black
seats, bumpers, etc. from a 1979 300SD (series 116), silver.

If you need a parts car, engine, body parts or other little expensive
Mercedes parts for 123, 126, or 116 series, or other Turbo Diesels,
please contact me!

David Z.

Try www:performanceproducts.com

They have the original wheels in either steel or chrome and many choice of
center caps.