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I have a '69 Buick Skylark GS chassis with what seems to be an 8.2" 'B' rear assembly. The casting mark is 1385724, it has the left hand thread 7/16" ring bolts, 1.875" pinion diameter, and 27 spline yoke. 10 bolt cover, 10 bolt ring gear, and 28 spline bolt-in axles. It came with 2.73 gearing and non-locking differential. I found out the hard way that aftermarket 8.2" ring and pinion and common 8.2" posi do not fit, and then I read that none are available that do fit. I'd like to convert to a locking diff and 3.42 gears. It looks like I need to find some NOS parts for this particular axle, or some good condition used parts. Is any of that available? Can JD Race help?