did Mopar make a four door HARDTOP?

Thats what I thought, but were there such made in the 60's? And ALL in C bodies?
Reason I ask, I have a 64 Belvedere more door, that is a great driver, I got it done except the seats. I have used the SmittyBuilt seats that are extremely close to the A100 seat, except the backs are fixed. I have used these on building super stock "style" clones on like the 64 Savoy I am doing now. These seats are very inexpensive like $300 for a pair. They are used in early Jeep CJs. I am thinking of using these on my 64 Bel. Not that crazy about spending lots of $$$ for upholstry in these more door. To many mouth to feed car wise! ll