need help finding this part

[chad64chevy]

im looking to put air bags on the rear of my '64 truck c10 with a schrader valve kit for now and i want to add them in the stock coil spring location! i found a picture of the plate i need and now i need help finding out where to buy them at! im looking for the top plate piece, any input from you guys would be great!! i know you can buy the 2 plates by themselfs and buy small tubing and make them but if someone makes these i would just buy them instead! thanks ahead of time for any input!!