I bought these adapters planning on installing the Garmin vector power meter spindles into my Shimano Ultegra pedals. I decided against it and just used the cleats that came with the vector pedals. When I tried to return my purchase it was outside the 30 day window for Amazon returns so they wouldn't accept the return. So I have brand new never installed Vector Shimano Cartridges for sale.
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This product is perfect if you would like to continue using you Shimano SPD cleats and or light weight Ultegra pedals with the capability of getting power readings.
Below is the Amazon's description of the product
Garmin Vector Cartridge Kit: Shimano Ultegra Pd-6800 The newest accessory for the Garmin Vector 2 & 2S Power Meters, The Cartridge Kit will help you train smarter and enhance your cycling performance. This easy-to-install pedal kit allows you to use Shimano Ultegra PD-6800 pedals with your Garmin Vector power meter system.