I mistyped the spline specs for the Torsion Bar Arms, should be a 1-1/8 40 spline pattern ast least the price dropped from $61 down to $48 each. You can't buy a 7075 or 6061 aluminum bar 1in x 2in x 18in for that much anymore!
Sway Bar Arms:
There appears to be 2 different styles of Sway Bar Arms,
One with side plates welded to the rear end for hanging the 2.5" aluminum shackles used with the welded tube style 3x3 trailing arms.
The other skips the side plates the end of the arm is drilled/tapped for a 1/2"-13 TPC inside thread Helicoil to hang the 2.5" aluminum shackles, used with the welded plate style 3x3 trailing arms
Note: whether the welded plate style trailing arms is an earlier part or a post 9ID replacement part is undetermined. Both Mogman's FAV 0010 and my FAV 0014 have the welded plate 3x3 trailing arms Roger Signalcorps both his FAV 0090 & 0091 have the welded tube style 3x3 trailing arms
Can we for clarity sake, call the welded plate boxed trailing arms Type A and the welded tube Type B?
The sway bar arms with the tapped end are approximately 1" x 2" x 15.5" long made from 7075 T6 or 6061 T6 aluminum bar.
Talking with Jshull11873 the 40 splines are the difficult part to fabricate. Speedway Motors Part 91037221 Aluminum Torsion Bar Arm 1-1/8" Spline x18" would be a good starting point with splines already done:
Speedway Motors Part 91037221 Aluminum Torsion Bar Arm 1.125in x 18in
Note: the splined end is slightly different shape and the bar corners of the Speedway Arm are radiused fore to aft; original FAV forward end radiused top to bottom. There may be enough meat on the Speedway Arm to copy the original.FAV but there is no changing the Speedway Arm corners radiused fore to aft.
The arm is tapered to the threaded tip, from about 3" from the bottom front edge,
the threaded tip has the top & bottom edges truncated, the threaded face is about 13/16" long, the top truncated about 3/8" the bottom about 1/2"
