suggest you read this about vintage radio and speakers first..
http://www.turnswitch.com/speakers.htm
may consider buying a 10 ohm test speaker before you burn up a vintage transistor radio..
I have talked to Greg, happy with the products I ordered, and great customer service..
and while S&M doesn't re-cone, I found a place that does..
http://www.nealspeakerservice.com
Mike rebuilt my 65 plate back to its OE 10 ohm goodness
there's a picture of one in upper left corner of home page..
good luck!