Help Finding Proper Spur Gear

[BrooklynBravest]

Hey all. In the process of working out my motor setup for rack and pinion table build.

I have the gear rack already its a 20 pressure angle 20 pitch 1/2" x 1/2".

Issue is the only gear I could find ended up not having a set screw with a 1/16" wall to work with.

What I need basically is

5/16 or 8mm bore. Ideally 8mm so no modification is needed.

20 pressure angle.
20 pitch
15-20 teeth range.

I found this one below however I am not sure if 20mm pitch is the same as 20pitch?

, http://shop.sdp-si.com/catalog/product/?id=KSSY1-20B

Thank you!