Arizona Mobile Air(website is www.ackits.com). In 1991 the folks at AZ Mobile Air installed an after market unit in a 1983 F100 I used to have. I sold the truck in 1999 to a friend. That compressor is still going to this day. I recommend Arizona Mobile Air. They make their own hoses and stuff on site. Real handy for those with older vehicles. I have to bring my '85 in as the compressor on that is leaking oil. I want to replace it with acompressor from AZ Mobile Air.