I had extensive discussions with Danchuk regarding their cable supplier. I was given the name and number with the promise I would not disclose their identity. It was not Control cable in California , the international company was located on the other coast. I contacted them to inquire about an order, and they requested the original OEM part #(GM 4662647). Their minimum order was in the thousands, which did not make economic sense to me. Maybe they now use somebody else?
I then ordered the danchuk cables
http://www.danchuk.com/ItemForm.aspx?item=221,
which are too short for a "58 burb, and shipped them to Mike Faust at Obsolete American Auto parts.He utilized the clevis portion of the cable, used nos reverse wound cable, and swaged the ball end and shipped them back to me. I provided my original cables for exact measurement. Mike's phone # is 814-244-0398.
Danchuk also sells the retractors and the tailgate balls and covers, which appear to be the same. Hope this info helps.
Mark