Ooooops ...?
Hello Chuck,
Very bad part for your car ... way too old.
Only correct for some 190 SLs or so
Our 113s had (still have) solid plastic washer bags.
There is an early style (NLA) and late style plastic bag available, the latter replaced the early one.
(Correct me if I am wrong here ...)
Both made of HDPE or something like that.
Those show up in used condition on ebay regularly and should be available new from the common sources (MB classic center, K&K, etc.).
Best,
Achim