Reese has about the poorest web site I have ever seen. However you can call the parent company TriMas Corporation @ 248-631-5450 and they will patch you through to Reese customer service.
The last set of trunnions I bought were $54.00.
If you get a new set try to oil them, a drop or 2, before each trip to make them last. Dry they will wear quite fast.
WBCCI 12156 AIR 3144 WACHUNG TAC NJ6
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles