Those will work for the rear, but the front like Mark said, are shaped differently because of the snout of the Cobra. Since you had a LSC, do you remember how thick the firewall is ?
I want to run a few wires through it with grommets and thinking of a kit like this, as I have others uses for them.
https://www.ebay.com/itm/250pcs-Rubb...RYadtM&vxp=mtr