Great information. Thanks very much. I will make a few phone calls. I already mounted the napa pump and would have used it if the pulleys had lined up. The napa shaft is longer by about 1/4". I am lucky that the truck has dual thermostat controlled electric fans, so the fan mount isn't the most important part. They were auxilliary fans as the truck was from a hot and hilly area at the Columbia River Gorge.
'92 F350 4x4 dual wheel service truck. 7.3 with headers and glass packs. 5 sp man tran. 255 85 16 Toyos. 110,000 miles. '59 F350 9' flareside new project, cummins 6at turbo diesel, sm 465 4 spd. 255 85 16s again, 37 ford 1 1/2 ton stake with 53 flathead V8. 65 toyota landcruiser fj 45 longbed pickup. 54 GMC 3/4 ton flatbed w/ cummins 6at, '68 BSA 441 Victor Special, bone stock, Antique tractors and one lung flywheel engines .....