I am the happy owner of a Märklin 43917 Wagen-Set in Pop-Farben;


I would like to extend it with 1 or even 2 wagons more! But I cant find anything on sale.
The main "problem" is, that these are 28,2cm long wagons, which I suppose is what makes it so difficult.
I KNOW that Märklin made the 43928 wagon (blue 2nd class) for a previos PopWagen Set, and this one might do, but alas is never on sale (on Ebay).

Before going under, Fleischmann produced lots of 28,2cm D-Zugwagens, and I suspect they might have done a run in PopFarben. Anybody in the know? I suspect that Roco would not have been producing them, after taking over Fleischmanns H0 range, so more information would be nice. Alas I havent been able to find online catalogues from Fleischmann with PopWagens, for the periode where they produced 28,2cm wagons but BEFORE being taken over by Roco.
Can anybody point me to a catalogue, or any product references?

Ideally would be a liegewagen (because of the additional purple/lilla colour!), but also a green 2nd class would be of great interes!
Any colour mixed 1st/2nd wagon would be nice too!
A blue 2nd class wagon would probably be the least desired option, but still interesting, if nothing else is possible.
(An alternative option could be a red DSG sleeping wagon)

Anybody got any ideas?