Anyone know where i can take a look at or find some high quality lock/unlockable sub box ports (port hole seals/flap) ?

Ive seen them used in a few show cars and just wanna track some down...designed for 12" woofers would be preferable ...for now dont worry bout box dimensions...

Im fater really good quality ones im not worried bout the money cause even some decent ones have sealing issues.

Thanks
Kev