HI, I installed a trans gov this summer. Luckily there was one on ebay for $300 at the time. But I did talk to someone at PJ Grady and the company who originally made the govenor is still producing them so they havent been sitting around for 20 years. They are not really "Improved" but Grady said they seem to work better than the originals. I would say Grady is your best bet as they are not NOS parts. good luck David [Non-text portions of this message have been removed]