1985 XR100 Spark plug issue!!!!!

So i sent my 1985 xr100 into a machine shop to replace the valves, helicoil the spark plug hole, and do some other things, well it turns out that they tossed my spark plug that i accidentally left in the engine :thumbsup: and i currently cannot find the right plug. i bought cr7hs plug and its too small, i think the heli is 12mm not 10mm. Please help i need to find the right plug!!!

DR8HS It has the same 1/2" reach as the CR7HSA, but is 12mm.

thanks alot! Sounds familar to the one I was using

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