22R steel-backed timing chain guides

I'm having problems locating 22R steel-backed timing chain guides. I tried calling DOA Racing Engines in Lakewood CA, but the number was out of service, and there appears to be no current yellow pages listing. I also tried D.O.A. in North Carolina, but no one picks up the phone, nor have they responded to my e-mail. Does anyone know any other sources? Thanks in advance.