I guess the old saying is true: the 3rd time's the charm. JBG finally got a rear driveshaft to me that fits. I wish they had used the later-style slip joint with more splines & an accordion boot, but I guess this is as good as I'm gonna get. The t-case & axle flanges are freshly cleaned, and after this paint dries, I'll clean it off the slip joint so it doesn't affect the seal.
34.5" installed length
16.25" between welds
~29.75" collapsed between end u-joints
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UPDATE: It blew apart a year later, so I ordered an all-new one from Tom Woods, which now has a few years on it and is working perfectly.