Looks good! These are actually used in HVAC as well, the difference from the standard cookie cutter AC contactor is the control voltage. The control (coil) voltage for the ones from your website are 110V or 240V. The ones I typically have in stock are 24V control, so I had to also install a 24V transformer. Yours would make for an easier, more straight forward build for most people. Fortunately, yes I get quite a discount (may need to rethink what I'm charging for installed parts after seeing those prices lol).