yea it should have plastic bits that clip on and channel the water 2 run down were the wing bolts on, very similer 2 mk3 gsis, think they called drip trays.
As said, there's supposed to be a black plastic deflector to channel the water away, but often they get ripped out by those thinking it makes them better or by slack bodyshops who can't be arsed refitting them after a spray. In all likelihood they probably warp and drop off on their own as well. See pic.
They're available new from opel-classicparts.com in Germany. 90197139 - LH Side and 90197140 - RH Side.