I had a bit of an issue locating the two parts you are showing, that is why I referred you to the picture. I guess this part - blower housing and the two side elements - are just one replacement part in the parts list (and shown like that on SLS picture), A 113 830 00 08 BLOWER. The picture in the EPC is similar to the one on SLS pages.
Therefore even if there were seals, you will not have them shown and specified.
Someone who dismantled the original part would have to tell. But also by logic, if this is the duct for the blown air, I would have cut a gasket out of a piece of thin foam and place there. You have this kind of gaskets in other places (parts 35 and 63 on SLS picture).