Do you have the part number for the STP filter?

This really confuses me. If the filter with plastic caps is the correct one to use, then doesn't that mean the one the dealer sold me was not the updated version. My old filter has the plastic cap on both ends. When I took it out, the paper looked fine to me. The one dealer sold me is just plain paper element, no plastic caps, but both ends was treated with sort of harden chemical.

Can anyone look up or verify what is the updated MB part number for the oil filter on MY02 W203 (C320/C32)?

Thanks.