CB450 520 front sprocket

I've been trying to source a 15 or 16T front sprocket for my CB450. It is an unusual size in that the spline minor diameter is 21mm, whereas all the other Honda sprockets are 22mm. There are a number of dealers that sell 520 kits but I tried contacting them all and no-one got back to me, so I did some hunting and it turns out that a Honda NSR250R has the exact same spline. These bikes were not available in the US, as far as I know, but I found one on UK ebay that was $26.31 ($18.68USD) including free delivery. It is a good sprocket for the application because it is 11mm wide, so it has great teeth contact and the standard keeper plate fits. A Kawasaki KDX200 also has the same spline configuration but is around 6.5mm wide, so the Honda one is far better.
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Did you contact Sprocket Specialists to get your sprocket? I've had really good luck with them. Also, Honda XL175 and I believe CB200 are 20 or 21mm. I can't remember which.

Thanks Irk. I couldn't get an answer from them either, perhaps because I'm in Australia. The XL175/CB200 are small spline sprockets, unfortunately, which are 20x18x5.

Rebel Gears will also make anything you want.