I just did a 17/43 conversion and rather then get the JTF518.B spacer,  I purchased the one Ryca offers as its an exact fit.   However,  on their site and detailed assembly instructions they use 2 spacers,  one on each side of the sprocket,  but mine was a single thick spacer so my sprocket is as far in as it can go.   I've properly lubed my chain and really shouldn't even have to add I got a high quality EK SRX X-Ring Chain so it's supposed to be maintenence free,  but while I'm riding I can definitely hear my chain.   I though I might of had it too lose,  so I extended the rear wheel back a bit, and it seems to have helped slightly,  but I am concerned that my chain isn't running straight. Should I contact Ryca and ask for the dual spacers,  because that's what they show when they build it up and on their online instruction manual for chain conversion,  so I'm sure they had a spacer on the inside for a reason I'm assuming...   Thoughts?