I have only come across one set of the 6 in wheels, last summer in sacramento PNP.

Here is a thread I started, asking about the 240 aluminum rims.
http://www.peachparts.com/shopforum/wheels-tires/277873-240d-aluminium-rims.html

This thread discusses the size/length of the lug bolts.
is there a difference between the 240D and 300D rear hubs?

Post #13 from the above thread, it states:
Observe wheel bolts.
1. For light alloy rims only.
2. For light alloy disc rims and steel rims only

# 2 is correct.

In my 240D owners manual it states:
1. For forged light alloy rims only.

this would mean for the aluminum Bundt wheels. this wheel uses the longer bolt.
the 240 light alloy and the steel wheel uses the shorter bolt with the recess and star in the middle.

Here is one from Benz-World. Thanks to ARMY.
W123 Aluminum disk wheel questions - Benzworld.org - Mercedes-Benz Discussion Forum
Charlie

__________________
there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works