................ Never seen 69 Shelby antenna mount like in your red Shelby pic as way to short of antenna tube for a pm-300 unless somebody shortened the lower tube. just sayin
Believe you have. That was the red GT500 unrestored car that showed up to SAAC a couple of years back. It was parked in the end of the row to the right (coming out of the hotel) of all the show cars we all judged. Know Bob and I spent some time talking to the owner and taking pictures. Length of the mast is another thing. Car number 0F02R482901.
Are you referring only to the tube length or where the strap attaches on the red car?
Marcus - clamp is missing on your top example above. Haven't seen that myself in the past
As for the attachment points for the strap I've got examples that fall into three basic areas.
1- to the pinch weld between the inner and outer wheel tubs
2- using the hole in the trunk hing support
3- just screwed to the inner wheel tub
As we talked about - found most of the straps with a single hole at one end and a group of holes at the other.