Wrong Brake Master Cylinder

Have a 1997 Coachmen Starfylte based on Ford e350 Chassis (not a dually) with a bad brake master cylinder (BMC). Can't find right master cylinder. Got 4 different ones (with & w/o cruise control doesn't make a difference) choosing e350 econline, clubwagon and superduty ---all have larger brake line connectors ports (specifically the one toward the rear of the BMC) than the one that came off the vehicle.
BTW, contacted Ford they say don't make one anymore but using Vin recommended one and it's incorrect as well....errrgh!
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Anybody have any idea how to find the right one? Any feedback to research would be helpful.
Thanks. Steve