60-66 suburban floor pan issues front and rear

[Ehud]

I am checking to see what others have done for their rear floor pan replacement. I have not found this piece reproduced and seems like i will have to fabricate something. I have successfully removed the rear pan with out much damage and should be able to use it as a template. I would also like to replace all of the floor pans in the front. The area where the seats bolt seam a little thin but these replacement pans are no where to be found. I can find full replacements for 67-72 but i have had no luck with 60-66. Are they not available?

thanks for any help