I just got a 1981 Suzuki from my in-laws. It´s partially disassembled and I don´t know what model or trim level it is. I will be buying a manual for it so I can repair and maintain it, the only problem is I dont know what my options are. As far as I can see it´s a GS450 but if I get a manual for a GS450L would the only difference be non-functional accessories like the syle of the seat or handle bars?