I located this forum while doing a search for "Kirby Performance Pack" while at my local Goodwill two days ago, I purchased 3 boxes of Kirby accessories, the regular attachments (Convenience Group)like a hose and nozzles was $2.99 and sales tax as was a complete box containing a Rug Renovator that looks barely used. The Performance Pack box was $4.99 and tax and contains a brand-new and never used floor polisher and carpet fluffer and belt (shown in photo 6 above) and it requires the Rug Renovator nozzle.
My Pack also contains a Turbo Brush, Turbo Sander, and Turbo Groom...I don't see a Turbo Brush in those pictures above. The real find in the boxes was the manual "Use & Care of the Heritage Convenience Group" that is dated March 1983. There seems to be a LOT of unused space in the Performance Pack box, but according to the manual everything that would be included in the Pack is there.
Thanks to all who contributed to this thread, you got me interested enough to join Vacuumland.
I will post pics of my finds and my beloved Heritage 84 if anyone is interested.