I found what appears to be an exact match on Vintage Trailers, but its out-of-stock for a while. They are trying to find a new supplier. I bought a pair of support arms that maybe the right match on TV Plus, Kemberly Inc Rockguard Arm 25" - 13" Retracted AWK501015 PRODUCT CODE: AR-050215. They cost about $13.00 each, shipping seemed a little high to me, but its the only solution I could find.
Fred & Denise (RVM157) New Mexico
2007 Excel Classic 30RSO & Coach House 272XL E450
2007 RAM 3500, Diesel, 6Spd Auto, SWD, 4x4, CC & LB