A small chance ACE hardware will have that, alternative, buy a very cheap parts radio that still has it.
I am gutting out some old radios that don't seem to sell, when I get to that point, I can senyou one.
Here is a nice tool for those:
Destuffing Wrench Tool:. 1Set (1Pcs T-1 X-Key Repair Tool + 1Pcs Destuffing Wrench Tools). Kenwood GP328 GP88 GP300 BaoFeng UV-5R 888S HYT. Type: Dismantling Machine Repair Tools. Black Plastic Ft8900 Panel Mount Bracket Fit For Ft-8800 Ft-8800R Ft-8900 Car UE.
www.ebay.com
You can use a standard hex nut if you can get a socket onto it properly.