Can I drill holes in this panel?

FYI I have recently replaced that exact red main breaker its a Murray MD-T. I don't know the Siemens part # but I think the replacement I got was a equivalent Siemens part number. Murray was pretty common here you should be able to replace the breaker if the bus bar is ok.
 
FYI I have recently replaced that exact red main breaker its a Murray MD-T. I don't know the Siemens part # but I think the replacement I got was an equivalent Siemens part number. Murray was pretty common here you should be able to replace the breaker if the bus bar is ok.
I think Home Depot actually stocks that breaker in some of their stores.
 
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