I have a '73 Marshall 8x10 with plastic handles that vibrate pretty severely at certain frequencies. I'm considering drilling out the rivets and using bolts or wood screws, or replacing them with Mojo's metal handles. I measure my handles at 10 1/2" x 6 1/2" while Mojo claims there's as 10 3/16" x 6 3/8" but suggest they fit older cabs. Is this a matter of "close enough"? The cab is near mint but it is one item I can safely say I'll never sell. What do you guys suggest? Thanks in advance.