FWIW, the I've done some research on sway bars for the '90-93.

The only two companies that make them are Suspension Techniques and Addco.

I've checked Greddy, SRR, Spoon, etc., etc. and they all make bars for '94 up but not '90-93.

KYB makes AGX struts for the front of our cars, but not for the rear (go figure!)

An inexpensive option to improve handling is urethane bushings for your existing sway bars. This noticeably improved roll control on my '91...but I want to autocross, so I need bigger sway bars.