Based on this product's specifications, here are some alternatives and similar models
Brake Pads Clarks for Hayes HFX-Mag / MX-1 / Mag HFX-9, replacement set (CLA-VX814C)
Summary description:
Replacement brake pads from Clarks compatible with Hayes HFX‑Mag, MX‑1 and Mag HFX‑9 calipers. Supplied as a set designed to fit specified Hayes models (MPN CLA‑VX814C). Intended for bicycle hydraulic or mechanical disc brake systems that accept these pad shapes, they provide friction material and backing plates for restoring braking performance and safe stopping on road or off‑road use.