It looks like the generic Dorman gaskets I saw for the master cylinder will not fit this application. I'm getting ready to call Mitsubishi. Depending on the price, I may get a master from RockAuto that includes the reservoir and cap, or I may just elect to buy the cap and gasket from Mitsu (or the gasket only).

I haven't looked at the Mitsu Fact Manual, but can those cam caps be changed with the engine in truck. I think I remember a tool required, and I'm sure they have to be pressed in from the rear, so probably a no go with so little firewall clearance. Oh well. I know it's ghetto, but has anyone tried cleaning that recessed cap area up really well, and laying a bunch of silicone over the entire cap, and then maybe greasing a steel plate up and finding a way to put pressure from firewall to the plate to "smash" the silicone against the cam plugs until silicone dries? I know it's ghetto, but I wonder if it might work? Isn't there like a 3/16" lip molded onto the head around the cam plug? That would mean 3/16 layer of silicone could be applied, maybe with pressure if a guy could put pressure on a plate like I mentioned. Then, after 12 hrs or so, remove the plates (the grease on the plate would allow one to do that). Heck, I don't know....what do you guys think? I know it's not optimal, but I'd be willing to try it if it would slow things down. (I'll have a look at the cam plugs on the engine I took out and get a better look at that recess, etc) I'm not even entirely sure that all of it is coming from the plugs, so I'll have another look at that this weekend if I can get a helper. I need someone holding rpm's up while I look from underneath after applying the powder...