Bucket seat confusion

[Buck_77]

I’m looking to redo my low back buckets in a 74 blazer. I can’t seem to find blazer seat foam in stock anywhere. I can find 71-75 truck bucket seat foam, does anyone know if they are the same? They look the same, but hard to tell in pictures if it’ll fit the frames. Any advice would be great. Thanks.

 

[bucket]

Far as I know, the low back buckets were the same for pickups and K5's into mid '77. During the '77 model year, the high back buckets started showing up and again, they were the same for pickups and K5's. Just the fabric was different.