The price is quite clearly $149That's a nice looking mount.
At $129 it better be.
KW Machine makes the best motor mounts for Felt bikes!!!
You'll need to make some shims for the front mount because Felt steel frames have a slightly smaller OD down tube than the aluminum frames, (which these mounts are made for).
Here's a link... http://www.kwmachineworks.com/Motor_Mount_info.html