Guys,
Having collected all the parts that I thought I needed to add a front Trombone oil cooler to my 73 coupe with an MFI 2.7 engine, I looked at the 72/73 Parts catalog, Group 1, Plate 1/6/2 and noticed some parts that don't make sense to me.

Reference # 53 (regulator insert), 54 (joint ring) and 55 (locking screw) show up on the picture for the front oil cooler but do not show up on the picture of the engine oil set up without a front external cooler.

First, apologies for not being technically astute enough to figure out how to attach a copy of the picture from the parts manual. Then the questions:

1. What do these parts do?
2. Where do they attach?
3. What happens if they are not there?

Thanks for the help

John, member # 322