luger magazine question

[HawkEye30]

Hi. My first post.
I bought the magazine on the right from ebay. It is too wide for the DWM Luger I have. It is about .477 inches thick. It does not have a ridge like the one on the left that fits my 30 luger. It looks to have a plastic base plate and follower. It was sold as for a luger and having a wooden base plate. what is the magazine for ? It cannot go into the DWM 30 luger I have. I have several magazines that do fit and all have ridges that are wider than the rest of the magazine width. The seller would not accept a return.
Thank yall