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Does anyone know any good sites to buy conversion parts for rhinos (other than forge world)?

I'm working on a GK army, and the plain rhinos just don't look fitting... I'm not looking for anything in particular, just some sort of module or something I can add to them to distinguish them.

There are a few different options for you. You could try Chapterhouse Studios, they do a number of conversion and detail kits compatible with the Rhino. There is also Scibor miniatures in the decorated plates section, though those are more intended for the Landraider some may be of use.

Tabletop art does create some additional rhino decorations. But they are for chaos and space wolves armies and not GK.

Maybe the Thousand son plates might work for you.
http://www.tabletop-art.de/Science-Fiction-Tools