Front seat stands? 39 Ford deluxe Tudoor?

[impala58]

Howdy All

My Dads old 39 Deluxe tudoor is getting ready to go to the upholstery shop. I was looking at his seats yesterday and saw he has no rear bolt on
stands ( I guess thats what you call them?) on the back side of his stock seats that bolt through the floor.

The front one are there on both sides are they the same as the rear ones? Or are the back ones the same but a different height.

If anyone can look at there's and let me know the measurement I would greatly appreciate it. Then maybe I could fabricate a couple rear ones.

Thanks So much
Mike