Chuck,
I only used that bracket in one or two of the WING EFX kits I installed.
Overengineering CAD people leading to double cost of basic components was the road-to-failure for Lehman.
Anyways, I have a solution ... possibly at least for the left side.
The photo was from the original Monarch II WING EFX kit and shows the bracket I am familiar with.
Different part number ... and I won't go into that ... but the main parts are the same.
The picture is of the right side bracket, B/C I didn't have a left side one to show.
Originally Lehman used a bracket attached to the foot peg pivot mount. Very simple KISS and worked for 10 years for me. Then they went on the CAD warpath !
Your board has slots to allow shifting of both the board and the attaching hardware.
Use a plain strap and bend to suit and remove the clevis pin for the pedal pivot and substitute with a bolt.
You can drop it and attach to the original mounting spot. A lot of work went into this explanation ..... you owe me !!