I have two eBay auctions in which this forum might be interested: The first is a differential. The second is a rear axle set from Great Basin Rovers.
Brand: Eaton, Tractech
title: NoSpin/Detroit Locker
Manufacturer Part Number: 187SL173A
The bearings and races are by Timken. I sold the vehicle for which this device was intended; it was never installed. It's time to sell this too. This device is worth about $600. The reserve is 375.00.
Great Basin Rovers
These are new, never installed 24 spline, heavy-duty, rear axles.
They are chromoly steel. They will not break.
They cost me about $700 new and are difficult to come by these days. I bought them for an '86 Rover 90. The transfer-case bombed out and I had to sell it. It's your lucky day. The reserve is $500.
They are meant for the rear of the vehicle, obvious by their lengths.
There are more details (and some photos) on the auction pages.
Thanks for your time.