Front sprocket for 410 chain.

I hope I searched enough and there aren't 100 threads on this.
I switched my chain over to HD BMX chain. It fit perfectly on rear and tensioner sprockets, but front sprocket is fatter. For the time being I spent a little personal time with the angle grinder and the Dremel and took a stock one down to fit. But we all know how long that'll probably last.
Where can I get a front sprocket for my China girl that fits a 410 chain?

Greg58 said:

All of the early engines came with 410 chain and sprockets, some of the long time vendors on the sides of the forum may have one or maybe a vendor on eBay. I’ve sent vendors messages on things and they have answered.

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Gee whiz. Thanks Greg. A response that straight answered my question. Seems people want me to deviate from my plan.
I really appreciate you support. Thanks.
Zeke