These are Barefoot Shims- the pale colour. I actually bought two and cut one in half. The thinking behind that, I was only needing to support the front and I didn’t need the lift the whole saddle. If that idea failed I had a spare set! It worked.
Now I am not suggesting everyone goes and cuts these in half. However the cost of buying an insert specifically for the front or back can cost the same as the whole pad, it was just an idea. Up to you if you trial and error that idea.
The black is rubber and I do not recall who this is by, it could be the Barefoot rubber but it arrived that short so it might even be a rear lift. ( if you turn them over they fit the front, a temporary solution)
What do you guys use let me know. Do you make your own, if yes where from. I could add to the links for others.