Here is a little bit of information that I think might be useful for those shopping for focusing screens:

 All the Rollei TLRs with non-interchangeable hoods can take the same size screen (56 mm x 62.5 mm, vertical orientation) by the use of the appropriate spacers (that I include with the installation kit for the particular model).  Those are the Rolleiflex models E, D, C, B, A, all Automats, all PreWWII models (except for the very first model which used 616 film, which requires a special size screen); the Rolleicord models I, II, III, IV, V (also called Va).

All the Rollei TLRs with interchangeable hoods (prior to the GX) take the same size screen (64 mm x 68 mm).  These are the Rolleiflex models E2, E3, F, F12/24, T, Wide Angle Rollei, Tele-Rollei, RolleiMagic, and the Rolleicord Vb.  Also, some non-interchangeable hood models may have been changed to interchangeable hood cameras by repair technicians.

The later Rolleiflex TLR models GX, FX, FW, and FT take a third size screen (55.5 mm x 62.25 mm, horizontal orientation). This is the same size as the SLR cameras from SL 66, SLX, 6000 Series and finally Hy6

Rolleiflex SLR models SL66, SL66E, SLX, the 6000 series cameras, and the Hy6 take the same size screen (55.5 mm x 62.25 mm, horizontal orientation). 

For a long time I had gotten occasionally a funny magenta or purple image with my iXpress or Imacon / Hasselblad digital backs on my Rollei 6008AF body.  I figured that sometimes a file just gets corrupted or hit a bad spot on the memory card or there was a loose cable, but on one occasion I had a number of these purple files in one shoot.       I sent some files to Hasselblad Support a few years back and Paul Claesson wrote a very informative e-mail with the explanation.   

Click the link to read the answer...

Several people have asked me what the differences are between the 6008AF and Integral 2 models, and sometimes people ask about the differences between 6008 Integral 2 and other models.    Ferdi Stutterheim has put together a fantastic table on his Rolleigraphy.org website so all I need to do is point to it.  Thanks Ferdi!    Here it is in case anyone is looking for it...

 Rolleiflex System 6000 on Rolleigraphy.org