This is your lucky day two showed up on eBay they look pretty nice you better jump on them

There also a clean 337 being parted out here in Texas by Texas Air Salvage. Late sixties model IIRC.

Didn't Work
 

I bough the eBay fuel selector valve and it shipped and arrived quickly. The problem is the valve is badly corroded and it will not move.

That’s a bummer. Maybe the valve can be soaked in oil to free it up
I bought the other BAD looking valve off ebay. Plan to do an autopsy on it to see what parts are in it, maybe create a parts list and sources. Of course already been established that the gasket will have to be self made.
Maybe check with Don Neiser at Commodore Aerospace? He just got me a couple hard to find items.

https://ibb.co/cTqVQX3
https://ibb.co/yXMLFY7
https://ibb.co/sgcSgVF
https://ibb.co/7g6Ljy5
https://ibb.co/GRFMmjV
https://ibb.co/fCq9SDr

I was gonna suggest you let let it soak in Evapo-rust, which has done miracles for me in the past, but that last pic really looks bad, as if the housing is breaking down internally. Hopefully the autopsy will prove valuable to our tribal knowledge!

I Found A Source
 

I finally found a source for the fuel selector valve:
Fenix Aircraft Parts Inc.
Christian Baez
6750 N. ANDREWS AVE
SUITE 200
FORT LAUDERDALE, FL 33309
Tel (954) 440 1445

Within a few days I had the valve in hand and I exchanged for my valve. The part cost $1,410 with shipping. If you don't have an exchange valve for him it is another $1,000 for the core charge.

It came with an 8130. I asked where it came from and he simply said Nevada. No other information.

Great work!

What shop name is on the 8130? Could we see a copy of it?

I wonder if he would've accepted that corroded Ebay valve as the $1000 core???

Vendor for valve
 

Webco Aircraft LLC
1134 N Oliver Rd
Newton, KS 67114