Kingmotorsports.com would most likely be the place to find anything JDM from Mugen. They are Mugen's official US distributor. As far as conversions go, you're looking at an entire front end swap (which coincidentally, is what you had to do on previous Civics for that JDM appearance, only this time, it's actually noticeable). You're probably better of ordering Acura CSX parts from Canadian dealers when it's released since it's the JDM Civic and shouldn't take as long to get the parts. Just throwing out some ideas...I'll let you digest them now
Good luck.