Beware: There are chinese knock offs that are selling through a USA seller that i have seen. These are not our product! This is the only place on e-bay we sell this product. The rest are a cheap imitations.

Up for auction we have a Firewall Passthrough and stainless steel hardware. It is CNC machined out of 6061 billet aluminum. It offers a 1 1/8" hole and a 3/4" hole. The outside dimensions are 3.78" by 2 1/8".  This is raw aluminum, with a machined finish. It can be anodized, coated or left as is. We have another similar design with a  sanded finish.

This is a 2 piece design, the upper and lower half bolt together with the center bolts then the 4 remaining bolts bolt the bracket to the car. You can remove the top half of the bracket which allows you plenty of room to install or remove wiring then you simply bolt it back together then reinstall the car mount bolts. 

This will not fit any car, fabrication is required. You need to drill or saw two 1 1/2" holes at a spacing of 1 1/8" then connect the holes via saw to create an oval (see last pic). Then deburr the firewall, center this bracket in the hole and mark the holes. Then simply drill the four 1/4" holes and install your sweet bracket via supplied bolts.

I included a sticker with the spacing (see pic),so simply stick it on and follow the lines.

 (TIP: if your firewall is clean or new paint stick the sticker on a rag or shop clothes first to knock down the sticking effect so it comes off clean)