Hey everyone, just wanted to let you know that I was able to find a low side fitting to switch over to r-134a on my trooper. Jerry Lemond is still looking for something to work on the high side, but until then here's the part number for the low side. This was purchased at a local AutoZone, number: 405-B. The SKU number looks to be 47876 02405. It's made by EF Products, Inc. It's a 1/4" (7/16" thread size) low-side retrovit valve). It comes in a package with two more fittings for the high side however those did not fit my trooper's high side fittings. Eitherway, I've been enjoying my A/C since I got the adapter . Also, wanted to thank Jerry for all of his help!

Take care,
- Jim