The images didn't come through, but using the links to eBay which did, it looks like you bought a 44522 and a 94138.

The 94138 (Hansen Rum Glass container car) looks like it has NEM coupler pockets, so you should be able to find a knuckle-style coupler which will replace the ones in your image. Marklin doesn't make those but a train-hobby store should be able to guide you.

The 44522 (Saugut Glass Container Car) has a Marklin-unique coupler which may not have a knuckle-style substitute. (perhaps someone else can confirm one way or the other).

Keep in mind most wagons made by Marklin are for AC operations, so the wheels on each axle are not electrically insulated from each other. If you run them on a DC layout they'll short-circuit the rails. You can buy DC wheelsets on the Marklin website or from other sources like TRIX dealers and eBay. I couldn't find a spare parts reference for these two wagons, so am unsure of the specific spare wheelset you'd need.

Hope this helps some...