Hi, I haven't been paying enough attention to the Forum! I assume you mean the pad at the aft end of the keel that is recessed into the hull bottom. I replaced mine a few years ago. I bought some 20mm thick delrin sheet. I had some problems with the captive nuts that the retaining screws screwed into which meant I had to cut the captive nuts out. Rather than just glassing in new captive nuts I made a 5mm s/s retaining plate that fitted around the back of the keel with tapped holes in the right positions, and epoxied that in. Making the pad was a bit of a challenge, I made clear plastic templates of the top and bottom of the pad, and used a profile gauge a lot. I may still have the templates I made - but it would be better to make ones for your pad. Once I had rougher out the pad, it took a lot of offering-up, sanding off and repeating to make it fit.
I may have some photos if you are interested and haven't sorted it out yet.
Regards
Dick