Need Vent window frame dimensions

[oldcouple]

Would someone please measure the bracket at the bottom of the vent window frame as shown by the red arrow for me? I have the old one piece window kit that does not have this part, but want to add a channel at the front per Blackdiesels window thread. Also need the size of the channel, depth etc. Mine are long gone, or if you can make a pattern and show it as a Jpeg would be great too, Thanks for any help.