The concern I have is
Jim, would a 90 degree fitting work in that location? The hard line in the bend may give more room for the bolt head, maybe?
I don't know. They also make 30 deg bends also.
They are an expensive little fitting, and on eBay, the vendor doesn't allow returns, so I'm afraid to use to much trial and error. I can use 2 of them on the front of the car, so I've got one more shot to find something that will work on the rear.
I thought about trying an elevator bolt , but I'm nearly positive that even they are to high.
I'm going to see if I can machine a 1"npt female coupler into a weld fitting and then use a 1" barb on the rear. Not nearly as visually appealing as anodized AR fittings, but it would still maintain stock diameters for our much needed desert cooling.