rear coil support plate

[dastuck]

I need to replace my rear coil upper support plates/brackets, mine are rusted pretty bad. I cant find anyone that sells these. I noticed some pictures of other 67-72's that just have flat plates riveted to the frame. Mine are more of a L shape. They are riveted to the crossmember and to the bottom of the frame. Can i just fab up a flat plate and bolt them to the bottom of the frame or do i need to try and find replacements like mine out of the junkyard? If i need to find replacements i noticed that there is a filler plate in between my stock plates and the frame due to the odd shape of the brackets can i just cut a plate to fit in there?