I need some on my '81 240D as well. In checking Tirerack.com, they do not even carry the OEM size. They suggest a 205 70 14. That's odd, because they sold me 195's for my 300D. I bought the Kumho's. Basic tire but good reviews on tire rack. I am happy with them on the 300.
As for the Dunlop's, they have excellent winter tires. If you do a lot of winter driving that is both on snow/ice and can be highway miles on dry pavement, they make a great sport winter tire. I have sets for both my Acura and TDI.

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'85 300D - 206K (sold)
'81 240D - 149K (sold)
'03 Jetta TDI - (sold)
'79 300D - (sold)