I got the old one off without removing the bed. I had hoped to have the new one on by now since the installation appears straightforward. Unfortunately the instructions are all photos and very little text. The unfortunate part about living in the middle of nowhere is that I am 25 miles from an auto parts store. The instructions make no mention of the graphite gasket needed to complete the installation and one is not included. Anyone else considering this setup would be wise to purchase a gasket prior to installation. The inside diameter will be 1.75" or slightly less than 45mm, the OD will be 2.3 inches or about 59mm.

I'm not getting off this hill until tomorrow, so I'll complete the installation then.