what rollers/sliders r good for a TGB? -

[fixitdave]

Im not sure whats in it now. They look stock cause they r white-ish and real big aluminum center . I tore the 2t down n found it has a 72cc bbk with carbon fiber reeds, 120 main jet, the head looks ported to me and the oil injection has been removed. Has red clutch springs and a stock replacement belt. Also, I understand the size rollers are 17×12mm . I have some 16×13, can I use those or will I tear something up?