Ah, so it's the Dak part that points down, and the Jeep Liberty part that is straight out. Both should have the same piston size, since they both use the same clutch lever inside the bellhousing. The Libby part MAY work easier, but you'd have to mount it up next to the brake MC, and space there might get tight.
Question... isn't there a hole in your firewall with a large plug where the OEM A-body clutch pushrod goes? Seems like if there isn't a hole/plug, there should be a depression stamped in the sheet metal that shows the right spot. That seems different than where your circle-X is shown. I'll try to dig up a pic of my stock setup...
