You're right. Any 'K' or 'L' frame holster for a 6" barrel will do nicely. You may want to look at other than Amazon though. And decide on a budget.
The closed muzzle end is probably going to be an issue. Lots of without.
https://epsaddlery.com/product/77-tortilla-holster/
"Fits S&W N" means it fits a Smith 'N' frame like an M29.