I couldn't find any gs500 stuff either. but a little advice. if you see a dealer selling stuff on ebay remotely close to what you need. send him an E-mail. chances are he can get it for you and it's usually for like half price. RIDE ON!!!
PS. I clean my chain every 2 lubes.... which is every 1k miles and it goes quick. a pain in the ass if you ask me. I remove the rear tire and soak the thing in kerosene and use an old paintbrush to get the dirt and grime off of it. when i'm done the kerosene is black and all the dirt is at the bottom of the pan I use. u'd be amazed hom much crap comes off. takes a while but the results are a sparkly like new chain. then, I take some gear lube (like 80w140 or some crap and with the bike running and in gear on the stand (I know maybe not a good idea but I live dangerously) I put a tiny bit on the chain on the 2 sides where the pins connect. Then, I let that work in and spray it with bel-ray chain lube. keep the gear oil in and off my bike, and lubricated the chain too! the result is the cleanest lubiest chain in the WORLD!!! BUA HA HA HA HA!!
