1961 A Arm shaft bolts/washers

[The1960APE]

I am buttoning up the front end on the truck and I ran across an issue while installing the upper A Arm cross shafts to the frame.
The original bolts had a washer that was round and had a a radius cut into the washer for the bolt head to ride against, the other side was somewhat rounded.
I ordered new bolts from LMC but they did not include this washer, the old ones are missing/damaged, I could only find one. LMC does not have a listing of this washer. Any suggestions?

Thanks