without the idler and of course the origin of the GMC blowers on the 2 stroke GMC diesels.........lol...............I just found the kit piece unusual and the online pics I found taken at an indoor car show before Walts Puffer got its "hair cut" does show the idler lower than most of the ones I've seen so the kit piece is essentially correct and I'll live with it.....lol.......its only a model after all & I'm enjoying the build......lol.......Andy Douglas