CT WTB Frame To Bed Brackets 66 K20

[Joe P]

Hello all, I am in search of the 2nd and 3rd frame brackets that mount the bed cross sills on a 66 K20 Fleetside Longbed. This is a 4x4 truck and the 2nd and 3rd brackets appear to be unique to the K20. I picked up a used set that I was told will work but only the first bracket will will line up with the holes in the frame. I don't want to drill any more holes in the frame if I can help it. I don't think that's even possible with the the bracket over the front spring hanger. My truck came to me without a bed, and the brackets were missing. Title, cab and frame numbers match indicating its a Fleetside K20 so assuming it had a bed on it from the factory. Photos should help fill in the blanks... Appreciate any help anyone can offer.