Size of JBL Emblem on Fender Cabinets?

I got this on eBay from China, came in less than a week. 71mmX54mm a little big compared to original. I going to drill some concave holes with a 4mm bit not all the way thru, then drill them thru with a smaller bit and attach it with small Fender name plate screws to look close to original. The eBay plate looks perfect but not original. I will keep looking for an original...
I picked up a '69 Duel Showman w/Reverb on Sunday in Philadelphia. Beautiful shape and has been recapped, new tubes de-death capped etc.
 

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