When I lifted the TJ 2" I got extensions for the bump stops - approx 1&1/2"

Then I changed to a 2&1/2" kit that didn't come with the bump stops & looking to pass on the spring spacers but been trying to find bump stop extensions to go with them but only ones I can find are in USA for about £15
I've seen hockey pucks suggested - I think bolted to the bottom end?
I also have these which are the same 1&1/2" but they are poly bushes not quite same diameter as the extensions but could they possibly be used?

Any thoughts or suggestions?
jerry