Leitz Pradovit RC tray/magazine?

I managed to pick up a Leitz Prodovitz RC 35mm projector for next to nothing but it did not come with any tray/magazine. I've been searching on Ebay to try to find a couple for it and have can't figure out exactly what I need. I also can't find the information on a general Google search. There appears to be a European standard slide magazine but some are manufacturer specific so how can I figure out what I need to buy? Whatever I get has to be shipped to Switzerland so I don't want to make a mistake buying something that does not fit. Can anyone link me to what I need?

You need the Leitz UNIVERSAL slide magazine normally they come in twin packs
(2x50)- manufactured by a number of companies,new from Amazon,secondhand on the bay.

Thank you!

Yup, as above but most any european "universal" carrier will work.

Thanks guys, ordered some today.