I think this topic has only been posted in the 2nd gen forum, so i figured i'd post it here.
check em out
http://hurleyrotary.com/seals/corner/cseals.htm

my friend demonstrated strength for me by snapping the stock ones with his index finger and thumb. Then he told me to squeeze the hurleys with pliers...and i couldnt break em!

any opinions?

 

As far as I know the corner seals aren't typically a weak point. If they are then just go with the solid center seals Mazda makes and add the 93+ springs. They are much cheaper and race proven already. On the Hurley's I'd mainly be worried about the durability of the tiny coiled springs.