Repairs Honda HR21 Carburetor & HRS21 Muffler needed

I'm rebuilding a HR21 SXA mower as well as a HRS21 SV and im almost done. Unfortunately the aluminum carburetor base for the HR21 has eroded away and the bowl will no longer screw into it. The Honda part number for the carburetor is 16100-888-075 (replaces 16100-888-065) If anyone has a lead on a new or used carb or even just the aluminum frame of the carb i would much appreciate getting in contact.

Im also looking for a muffler for the HRS21 SV Honda part number 18310-ZE5-003 used or old stock as long as its intact.

Thanks for all your help.