Paul
I had the same problem when I got my insulation pads from SLS in Hamburg. I simply cut it to fit. It can be tricky to figure out how it fits, but eventually you will figure out which is the right way. Remember that you can't see the pad unless you dive into it, so unless you are into concourse shows you'll be fine.
Ulrik
'67 250 SL Papyrus White 113043-10-000023