I have sennheiser pc 7 headphone. Seems to be approximately 2.2" diameter. Will they work?

Yes, they will work. And detailed Dimensions of this replacement are below: 58mm/2.28in(overall diameter), 34mm/1.34in(mounting diameter), 14mm/0.55in(thickness). For detailed information, pls check the FOURTH picture about the product size.

I have no idea how to install them on my plantronics headset. Can someone help me?

Hi, pls follow our installation steps below: Step 1: Get off your old ear pads. Step 2: Push ear pads fully in and stretch them around to cover all edges of headset ear loop. For detailed steps, pls check the following video about installation.

Has anyone tried to use them on a Mitel 5340e IP phone headset before?

Haven't tried it. But it fits over my old Jabra Pro 9450 Wireless Mono Headset. The cushion is soft and gives my ears the right amount of comfort needed and makes my headphones seem new.

Do these fit the plantronics blackwire c320 headset? Thanks.

Yes, these foam earpads fit Plantronics Blackwire C320 headset and other models like C3210 C3220 C3215 C3225 H251N H261N H351N H361N. For other models, please check the compatibility list or consult us for Compatibility Guide.

Manufacturer	Callez
UPC	796914367727
Model	WE04-10P
Model Name	WE04-10P
Package Dimensions	20.09 x 15.8 x 3.91 cm; 18 g
Item model number	WE04-10P
Number of items	10
Batteries Included	No
Batteries Required	No
Item Weight	18 g

Ear Cushions for Plantronics Headset, Ear Pad Replacement Headphones Earpads Designed for Plantronics Blackwire C320 3210 3220 3320 HW251N HW261N HW510 Jabra Biz 2300 GN2000 PRO 920 9450 (10 Pack)

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