For Shimano users, we recommend the Quarq DFour DUB Power Meter. Featuring a 110 BCD, 4-bolt configuration, the DFour will allow you to use your current Shimano chainring on your new power meter. Please note, the DFour is ideally suited for DURA-ACE 9100 rings (due to cosmetic reasons), however Ultegra R8000 and R7000 105 rings will also fit. They just don’t match the color of the power meter as nicely.
You must pair the Quarq DFour DUB Power Meter spider with Quarq DZero DUB crank arms. You can select the size you need right on our product page. You also need a SRAM DUB bottom bracket.
We also have an article with some additional information here.