2nd gen oil cooler
 

I have a gslse with the 12a water/oil cooler. I want to replace this and install the original oil cooler that sits under the radiator. I've looked for a gslse cooler and can't seem to find any. The 2nd gens oil coolers are more readily available. Can someone help me here on this installation? Is it possible to install this 2nd gen cooler on my 1st gen? Does anyone have a good solid no leak gslse oil cooler?

The FC cooler work fine.It has better,swivel/banjo type fittings that can be pointed any direction and dont split like the 1st gens do.
Youll have to fab the mounts,but its not that hard since the 2nd gens use stubby,firm mounts unlike the FB "hanger" type rubber mounts.The FC hoses will bolt up to an SE engine no problem,just be on the lookout for leaks.
If you need longer hoses due to custom mounting of the cooler,its easy to grind off the factory crimps and make your own lines with some good quality 1/2" ID hose and a few screw clamps.Stainless lines are not neccesary,just go to a hydraulic/bearing house and ask for some 1/2" ID rubber hose good for say,300psi working pressure and 400-500*F operating temp.Thats well within the 0-110psi and 0-250*F conditions it will be working under.Then run your lines and double clamp each end.Ive done it this way for years on many engines,it works great and only costs a few bucks.