Jeff and Ken, the pictures are very helpful, thank you!!! Sorry it took so long to respond, but I've been pretty busy assembling other areas on the car. I'll post a couple of pictures. Doing some scaling of the pictures, my take is that the oval is about 3 times as long as it is wide. Since the rubber tube is 13/16" OD, I'll probably make the width 3/4" and the length 2 1/4". It appears to be at about a 25 degree angle, but the long axis should merely follow the angle of the cable from the parking brake control assembly. The center of the oval appears to be at 6:00 below the steering column and just below the break of the toe board. The cable bracket screws will be just inboard of where the rubber tube protrudes into the engine compartment. Pictures to follow. Thanks again!
Craig