70 Challenger 8-26-69 SPD

The drivers floor was patched in the early 90's before I got the car. The patch was never painted and was already rusted with lots of pinholes when I got the car. I've replaced the floor now, but am missing the spotwelded on bracket/tab that goes on the bottom of the floor to hold the speedometer cable.

1. Is there anywhere I can get this tab, or do I need to make one?

2. What are the measurements for the tabs location?

As often as people replace floors, hopefully the answer is readily available. (I could also use measurements for where to locate the dimmer switch.)

Tav