Adjustable panhard rod and both swaybars can be purchased aftermarket for these. As for a coilover setup, yes it will be too much stress for the stock rear mount, however you should be able to fabricate a stronger mount and position it where you want.
Unfortunately for you, this is all very much custom conversion territory, so you won't be able to just change parts with other cars. Also, if you are going to go to the trouble of sorting out coilovers on the rear, would it also be worth changing out the diff to an IRS setup, possibly from an S13 Silvia??
For the panhard rod and swaybars, try Whiteline, Sleeka Spares, or Ebay. TechnoToyTuning may also help you out.
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