Cuda seat bottom 1970 cuda. T

Have an original interior 1970 cuda. The seat bottom has a small separation where it looks like a seam. Any one have ideas how to fix it. Or can I just find a used seat bottom and replace. I don't want a new one cuz it won't match the rest of the interior. It's black non leather.
Thank you
Iggy

I'd post a parts wanted ad here for a nice original. I had the same problem with my 71 Challenger and found one. My interior is original too.

They were made originally by Uniroyal.
I had a NOS one a Friend bought in '72 from Ma Mopar.
Try Frank Badalson, he might have something.