I would think that your Massey dealer might be able to help although I must admit that all the 135's I've seen around here either have no ROP or they have a home made one and those range from the flimsy to the "Holy cow, how did they manage to get that up there?" type. You might find it tough to get someone to fabricate one for you these days. I know my welding buddy won't do it any more because he's afraid of liability issues.