Generally, the Ultegra version of the cage from the same series will be compatible with the Dura Ace version.

Another option would be to hit eBay for cheap aftermarket/no-name brand oversized pulley wheel systems. I put a KCNC OSPW system in my wife’s bike with 7900 series Dura Ace and it was under $80. Also increased the allowable cassette size to 32t if I recall correctly.

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MS: Exercise Science
Your speed matters a lot, sometimes you need to be very fast, where sometimes you need to breakdown your speed.

Can you get one of the oversized pully kits out there? When I did mine, it came with a slightly larger cage.

Thanks, what would be the Ultegra series numbers be. Would it be the R7000?

I looked at that and have no problem with it, it's just that when I look at the models they don't have Dura-Ace model numbers and I'm not confident about comparable Ultegra models.....I know they might be interchangeable, but .....

Ultegra 6700 is the same gen as Dura Ace 7900.

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MS: Exercise Science
Your speed matters a lot, sometimes you need to be very fast, where sometimes you need to breakdown your speed.

Thanks I needed that I almost ordered the wrong thing based on common sense (which I obviously lack), thankfully your note came in time....