I've got an early standard one you can have - it was a bit inconsistent on tight donuts when it was in, though it always drifted fine at Bordon, Silverstone and errm some other "private" places...
I'd say it would be worth rebuilding it while it's out though (like any ~20 year old LSD!!). An easy job with Gabriel's $150 uprating kit. The unit has done about 80,000 miles.