[masraum]

Yeah, obvious, but then "people are idiots" springs to mind.

"Shop by category"
"Checkout"
"Shop Brake Pads"
"Shop Brake Kits"

THose should make it pretty obvious.

Maybe reorder "shop brake kits" "shop brake pads" and "stasis hardware". Put the "stasis hardware on the right.

Do you have a tracker that identifies the screen resolution of your shoppers, and is your website setup to display well on that size?

I clicked "shop brake pads" and it was even more obvious with the way to filter on the left and the "your price $336" under each item.