Goodrich tells me to call Coker

Several of you have given me great ideas for wheel/tire combos and even for my 68 Barracuda and convinced me to go from 14" to 15". I checked the tires on it now, 205 70R 14s. Man do they look small. Anyway, I contacted BF Goodrich because I've always liked the T/A Radial, and asked them about tires in 15" sizes. Based on the YEAR of my car, they told me to contact Coker because they would have tires for old and classic cars. So, I go to the Coker webiste and they have the BF Goodrich T/As I am interested in. I'm wondering why, if they are BF Goodrich tires, Goodrich would send me to Coker. Am I missing something?