Y block water pump question
This water pump came off a 292 y block in my '58 f-600 fire truck with 3043 original miles. It needs a new one as it's leaking badly. I got a f-100 one from napa but it's quite different and mainly it doesnt have the remote fan mount. I read that the pump with the flange for a bolt on remote fan was stopped in '56, so I'm confused. Is this somehow an earlier pump than what belongs on a '58? The shaft is also about a 1/4" longer on the napa one, but it bolts on. Any help needed. This is my first y block I've had. Thanks
'92 F350 4x4 dual wheel flatbed truck. 7.3IDI, 5 sp man tran. '59 F350 nine foot flareside with cummins 6AT, '47 2 ton stake with 8rt, '47 tonner panel, 47 tonner pickup,'46 tonner cab/chassis, 47 1/2 ton pickup,'46 1/2 ton panel. Antique one lung flywheel engines.