S&M Electro-Tech, Blaine, MN. 877-780-2861 www.turnswitch.com

You can look at the parts offered online, but you have to call to order. I have the original AM radio in mine too, and the speaker was toast. I got the 4' x 10" slimline oval. He asked if it was the original radio and soldered the correct ends onto the speaker so the original harness plugged right in. He was great to deal with. It is 8-10 ohms.