Depending on the parts you need a junk yard would probley be your best bet.
where con i find parts for a rohn gmbh 22 long mod 66
dodo face
fury 66: Blue strip
Route 66 - 1960 A Fury Slinging Flame 1-11 was released on: USA: 30 December 1960
You can find a parts diagram on the CROSMAN homepage. Click on "Download a manual" (at the bottom of the page ) There you will find an owners manual and parts diagram for the model 66. Parts are still available through Crosman. See the related link.
GUNPARTSCORP.com and JACKFIRSTGUN.com carry lots of parts.
look for the round chrome plug in in the fuse box.
66
You just need to install a power brake booster between the master cylinder and the firewall and then supply vacuum to the booster. I would recommend you hit the salvage yards. They will be able to sell you all you need. This is a very simple conversion.
NUMRICH HAS PARTS FOR THE STEVENS 66B
e-bay or a local swap meet is your best bet.
It will depend on the condition. Could be $200 or $100,000.