Hey Greyduk,
The openings are too small for a "Contura" style switch. You might be able to file them open enough to get it in but it will be a pain and I'm not sure of the finished look and whether you'll be able to read all the labels.
It would certainly seem to be easier to buy a new Blue Seas panel...however, then you have the existing circuit breakers and the short jumpers and its a pain.... after thinking it thru I went with trying to find McGills that suited my purpose.
I had a post about those mcgill switches...look up "oval "euro" nav/anchor DPDT switch?"
The oval McGills are strange, they light differently than the Contura style. Had a hard time finding what I wanted on eBay. found some at GreatLakesSkipper. I still have extras that didn't pan out.....
I put in a livewell timer and changed the switch to a lighted On/off/on so I could have livewell always on/off/timer. The only oval switch I could find has 2 red lights and they light opposite of what you would expect.(telling you which one is off instead of which is on). They don't have LED lights they are incandescent.
Someday, If I ever get the nerve to commit and plop down $36K for 2 motors, I'll redo the entire dash the way I like and those switches will be the first to go.