:? I can't say for sure, but it seems to me the brake pedal would hit the diagonal fuselage tube that runs from top left to bottom right behind the firewall. You can see this crossmember if you duck under your instrument panel.
This being said, I've seen dual brake conversions, but I'm not sure if this was on a 14-13- or a 14-19 :?:
Anyone else out there with more info :?: