PEHaiges,
Yes, I intended to say that the 82 model had the "Pin/pencil" type plugs/wire harness but the engine we installed, being that it is out of a 78 240D has the loop type plugs.... so I wish to convert the larger diameter threaded holes in the cylinder head so that I can then insert the newer type glow plugs. It would appear that I have several options:

1. direct wire from the battery a power cable with a manual switch to the existing glow plugs (loop type) and just leave them in there along with the metal resistor lines between them.

2. get the Bosch pin type plugs that have the large diameter threads and use existing 82 model's wire harness/relay system

3. get some kind of inserts made up that thread into the larger holes of the old type heads but have an inner diameter hole that will receive the new pin type glow plugs.

Sounds like a no-brainer to me.......get the new plugs with the larger diameter threads.... for $60 plus the freight, I'm done with this project....... I like it!!!

Thanks to all for posting up, I appreciate it very much!

JMH