I am about to purchase a pair of these speakers from a local seller. One of the mid-range drivers is dented.
I see there is one for a Performance 5 on eBay:
Was it the same model on the Performance 6?
I see there is one for a Performance 5 on eBay:

One New Mordaunt-Short Performance 5 CPC 5.5'' mid/bass drivers MSPW5-6R8 | eBay
13cm (5”) CPC mid/bass drivers. "Designed to be the perfect speaker, Performance introduces nothing and subtracts nothing from the audio source it's playing. A clear and detailed "wow".".
www.ebay.com
Was it the same model on the Performance 6?