Spare Tire Carrier Mount For Trailer Tounges and Boat Trailers. This spare tire mount is. Compatibility & Fit: This trailer spare tire carrier is designed to fit trailer tongues, including boat trailers’, to 2.95″wide and 3.94″ high, and is further upgraded to hold 4-lug and 5-lug wheels with 3.94″, 4″, 4.25″ and 4.72″ bolt patterns.
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