I want to put cable guides on two of my bikes where the down tube shifters currently are. One has Suntour clamp-on shifters and the other has old Shimano 600 Arabic design clamp-on shifters. Does anyone know if the Shimano Dura Ace downtube cable guides will work on these bosses or if there is some other specific type of guides I should look for to work with either one or both of these bikes. Thanks for any help and advice.