If yu can't find the material through one of the RV Supply distributers, many in the Elkhart Ind area you may look to an architectural supply house that specializes in metal extrusions. Another area to check would be glass shops as metal edging is common there also.
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