My solution to the Dual M/C mount opening

Here's a picture of what I ended up doing to seal the opening where the brake push rod goes through the dual M/C mount. Looks like a mini CV joint boot! I used a 2 3/8 hole saw for the inner hole, the outer size is 3.5 inches. Forgive the uneven outer edge, did that free hand with a jigsaw, wasn't concerned with cosmetics, as no one will ever see this. Same with the not perfect screw spacing, eye balled it. I'll countersink the screws some more, but as it is, it fits perfecty in the recess of my 944 firewall. I tapped the mount for the M4 screws. I'll add sealant to the boot where it touches the mounting plate before I install it for good, and paint the aluminum ring to help prevent corrision. I'm hoping to finish this up this weekend, as the brakes and clutch hydraulics are the last step to getting the beast out of the garage on its own power.

Looks great!