My PET 2001-8C had the wrong tape drive, one with white buttons and a bit slimmer than what is supposed to go in there.

Looking for one of these, not necessarily a working one, the part that shows when mounted is allowed to look nice.
http://scacom.bplaced.net/Collection/c2n/c2n2.jpg

Currently I have one of these, doesn't fit very well:

Click image for larger version. 

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So I stuffed a white one in there for now, which looks nice - but it's wrong.
Click image for larger version. 

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