CFR Firewall Shifter Bushing, Fasteners Options

[TargaToy]

I'm installing Chris Foley's firewall bushing which is a beautiful design.

Has anybody installed one using fasteners other than the sheet metal screws or pop rivets that came with the kit?

I've been contemplating installing #10-24 riv-nuts after reading someone else's experience with either the screws or the rivets (I can't remember which) working loose over time.

What's your experience?

[TargaToy]

Here's a little follow-up.

Picked up a large washer with an ID of 1.25" (give or take). With just a little filing, it fit over the shift rod flange on the inside of the tunnel.






I ended up opening up the holes in the CFR housing to accept 6mm bolts and then used it as a guide to drill the same pattern on the large washer. Tacked the 6mm nuts. On another go-round, I would find a thinner gage washer or cut one myself out of thinner steel. At 1/8" thick, I had to have the heat set so high on my welder that I had to be very careful not to liquify the nuts.




And here's the final product installed in the car. Ended up going with button head allens for a cleaner look. I will note that I used 30mm length bolts but will likely be replacing these with 45mm as I didn't get as much squish as I expected and would like the bolts to run through the backer nuts completely (vs. just flush).