I am told that the euro 113's have a different pad from the US models.
Nonsense.
Where have you been told that??
The firewall pads are all the same between same-aged Euro and US SLs.
There are a very few differences/designs of material choices available over the 8 built years of the Pagodas
but no difference between Euro versus US.
Only difference is that the later US cars had no cut-out for the body number plate (located at A- pillar and later ot B-pillar) anymore.
Achim