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Originally Posted by hawthorne90250
Be careful, the G/Ps that come with the kit are to replace the old type filiment G/Ps and are 18mm, i think later cars the G/Ps are 14mm thread.  |
He's talking about a different kit to upgrade the stock relay to the "post-glow" type:
http://cgi.ebay.com/ebaymotors/Mercedes-glow-plug-relay-W116-W126-W123-300D-240D-300SD_W0QQitemZ8051363305QQcategoryZ33693QQrdZ1QQcmdZViewItem
The kit you are referring to is to update from the old filiment G/Ps to the pencil type, his 81 does not have the old filiment G/Ps.