B7200 hst e i.d.

Hi have a B7200 everything is marked B7200. bought the tractor new.
Have need for steering parts.
specifically sector shaft if anyone has one please let me know.
meantime my problem is:
my serial number which everyone wants to know cause my shaft is different from the one they are offering is B7200 H E 10909. everyone says that my tractor is not a B7200 because the serial number is way to low. they say it should be above 50k. I sent pics of the stamped in the frame numbers EVERYTHING to no avail. one guy says my numbers are obsolete and there are no part numbers for that tractor. The list start in 1983 for the B7200.... were there earlier numbers perhaps from other countries brought to the U.S. ? and even then why would my sector shaft be any different...any help please....need my tractor back!!!
Elliott

Thanks for the support. the part number i come up with is 66811-41150.
But all those people with that number say the shaft is 1" in diameter with large splines and 13/16" nut and is 7-1/8" long.
my shaft is 6-1/2" long, 7/8" diameter, 33 splines 13/16" to 7/8", thread size is 5/8".
I have asked several suppliers for the measurements of their shaft but never get any reply.
hope I can get some additional info and a lead on this illusive shaft size.

Got the correct part...great help and service from All States AG Parts in Black Creek Wisc....thanks Chad