It's in the owner's/maintenance manual. There are a number of 124 chassis service manuals on e-bay right now. Not exactly your model year, but still might help.

See http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=8040598646&rd=1&sspagename=STRK%3AMESE%3AIT&rd=1

Len