I have some of these on mine. They are quite popular on Iceland as they mostly make overlanding-rigs for glaciers.
Give Arctic Trucks on Iceland a shout on email: info@arctictrucks.is www.arctictrucks.com. I don't think they build that many 80-series any more, but they might have a pair laying...
I would gladly give you access to my rig, but it's kind of a long drive from Norway to Idaho.
Just let me know if you are interested in some measurements. I have an OEM manual '94 with VX interior.