Your best bet would be pulling them off of an Ascender if you can find one in a junkyard. The front ones are attached with plastic rivets and some 3M trim tape and the rear ones just have the tape, so some fishing line and adhesive remover will help with removing them. The fronts are the same on short and long wheelbase trucks, but the rear ones are 2 pieces on short wheelbase and one piece on long wheelbase trucks, so try to find one like yours. Isuzu left the US passenger vehicle market in 2008, so Isuzu specific body parts are impossible to find new for the Ascender.