Juciy Carbon 160mm fitting onto Marzocchi MX Pro ETA 2007

Right Ive got Avid Juicy carbon brakes on my bike at the moment which have 160mm rotors front and rear, but Ive just got some new Marzocchi mx pro eta forks which are post mount. The juicy calipers currently have a post mount to IS fitting on them as my current forks are IS. Do I need to buy an adaptor to fit the new forks or can I simply remove the one Im using at the moment? Therefore making it Post mount on the fork and Post mount on the caliper?
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Posts
did you look at the sticky?
Parktools :?:SheldonBrown
Although 1 question, is there a way I can run at 185mm rotor if I wanted to with this caliper/fork combination?
Or is is just a choice of 160mm or 203mm?
avid do 2
11.5310.187.000
CPS, 185 post Disc Brake
Hardware Kit, Qty 1
11.5012.868.000
CPS, 185 post Disc Brake
Hardware Kit Ti, Qty 1
Parktools :?:SheldonBrown
Cheers.
Parktools :?:SheldonBrown