I just replaced my 993's pad when the engine was out with the Appbiz Ultimate pad from here on Pelican. It was a bit challenging getting the new pad situated with the engine out, so I can't imagine the number of swear words that would be induced if I tried with the engine in.
If the pad's sagging near the trunk edge and the engine's not out already, I would consider David Etter's Pad Keeper (The Pad Keeper). I even installed one on my new pad because I liked the clean look.
For those using the Ultimate pad, I found that a pencil-style soldering iron was the easiest way to punch holes in the ultimate pad.