If price is not a consideration there is only one--Vintage Air in San Antonio. Chisenhall and his crew probably do 99% of all the R&D on air conditioning applications. As soon as they develope a new one the competitors buy one and offer cheap knock offs a short time later. Probably run you about a grand but will work and look good. One thing you can do to make a system go from good to great is to insulate everywhere--above the headliner, behind the gas tank, inside the doors, under the seat, in the kick panels, under the floor mat, and on the inside of the firewall. We discard the jute matting and replace all with double foil sided blister insulation. There is also offered a thin flexible space age insulation that is pricey but said to work good. What is nice about the foil is you can use aluminum duct tape and the seams will be invisible. A side benefit of doing this is you can hear a mosquito in the cab pass gass while driving down some railroad tracks.
