I just went through a great experience with Old Air Products Co.
in setting up the AC on my '53 Chevy pickup. As shown in my journal, I used their evaporator that was made specifically for my truck. Nothing special there. However, I am using a condenser from some foreign car that has the built in fan and am remotely mounting it under my front apron behind the bumper. Hidden from view and not out in front of my engine radiator overheating my engine. I know that in the past year or so some vendors have come out with an after market version of this item but I already had mine from the junk yard and I always prefer DIY to buy and bolt.
That is where my trouble started. One fitting on my condenser is a #5 O-ring fitting to a #6 hose. Try and find one of those in your spare time. I needed the full fitting and hose setup so I took my stuff to the Old Air booth at the recent NSRA Western Street Rod Nationals. There I met Jack Horner, VP of marketing who gave me at least 1/2 hr of time figuring out what I had. They didn't have the parts to set me up at the show so he took my info and promised to get back to me. I thought sure, a VP is going to call me back. He did! Not only that, he informed me that my #5/#6 fitting is rarer than hen's teeth and he was doing a search. Took tow months to track that sucker down and Jack gave me weekly email updates of his progress or lack thereof.
He finally found it and it got the custom kit he put together for me in the mail today. I have to say I am amazed how well he took car of a hair-brained customer like me. I will use NOTHING but Old Air from now on!