Bob, the Force propellers usually came in 1/2" configurations whereas
other props were configured in whole numbers. That's why you may not
find a direct replacement elsewhere. The 287 number was only used by
Force as their part number.
I don't recall stainless props being available for that engine and I
would not put the Comprop in the good performing category.

Good luck and good boating,
Jim

Bob La Londe wrote:
Looking for a prop for a Force 507F90C

The current prop is starting to get a little beat up and I would like to
relegate it to being a spare.

The numbers on the prop are 287 - 11 1/2 and in another place it says 102 3.

When I looked on-line at places like Cabelas and Bass Pro Shops I couldn't
figure out which prop to buy since they clearly show pitch and diameter, but
not the numbers I listed above.

If possible I would love to find a good stainless steel prop for this motor.
If not I'ld like to know if there is soe other good performing prop I could
use like a Com Prop.

Alas if all that is available is another identical aluminum then that is
what I will go with. It pushes the boat it is on adequately and turrns
exactly the right RPMS at WOT with a full load.