seat track brackets - Who has some

[RF RIDER]

All;
I tried contacting David Borden for the 4 seat track bracket that he made. I have had no response. Just wondering if anyone
has a set to sell or knows if someone has taken over the selling of these.
Worst case I will make my own, but would then appreciate if someone could measure theirs and post the dimensions of the bracket.

Thanks for your time.