Here is an SS-MCU thread
with some more info I found using the "FIND" feature, @ top of the Alpine Owner's Forum. Dale tells how to get your line size (outside diameter I presume).
@ Q'zite DRR I spoke to the teenie-bopper at the Hendersen display. He indicated only a need to know line size, and then he'd sell me a kit per axle (they need to be installed in pairs to cover front or rear axle). He didn't say anything about "pressure." But then I'm not sure he had started shaving yet. Hopefully you can elaborate when you get a complete answer, and let us know what it cost for parts & installation & who did the work.