5A – OEM Type
OEM oil line from thermostat to front wheel well, return side along rocker. This is the line that is bent around the jack receiver.
As equipped on ’74-’89 911/930.

5B/5C – Finned Oil Line Specialty Type
Specialty return pipe interchanges with 5A and connects from thermostat to front wheel well, return side along rocker. Short fins on the tubing surface dissipate heat to supplement the oil cooler.
As equipped on ’74-’89 911/930.
This return line can be used on ’65-’71,’73 with ’74-’89 thermostat and components.
Find complete kits for all ’65-’89 911/930 on our oil cooler kits page.
- More on Finned Oil Lines here…

This part also goes by the following cross reference.
Cross Reference Part Number: