It's surprising no one is making old school rubber matts given all the classic cars. Most of the modern ones are fancy or modern looking. Or just plain ugly.
Two options I've seen is there are company's that sell old style rubber matting by the meter. Then u can cut to shape and gring a border in with a dremil.
Other option is there are some large fairly plain rubber matts around (repco supercheap etc) that can be cut to size.
_________________
68 Morris Cooper S Mk1 (*ex 78 1275 LS 4th last built, 70 Morris 1500 OHC & 70 MiniMatic)