All Roadmaster Base Plate Kits like the XL Base Plate Kit, item # 1170-1 that you purchased, place the brackets at 28-1/2 inches apart on the vehicle. If your cross bar is the incorrect width you will need the Roadmaster Quick Disconnect Tow Bar Base Assembly, item # 910021-00.
This dimension should work correctly with the Falcon 5250 Tow Bar as long as the crossbar is the original crossbar for Roadmaster base plates. You can measure your crossbar to determine if it is correct.
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