ABS Module

I have 8 ports on the ABS module, all of which disconnected.
I guess the ones labelled RR, RL, FR, FL are front and rear left/right hand side (whilst sitting in car). After searching through haynes and on tinterweb I am pretty confident that PRV IN and PRV OUT are in/out lines from rear pressure reducing valve which is bolted to nearside bulkhead.

This leaves me MCR and MCV - can anyone put me out of my misery here??
Thanks

Typo, it's MCR and MCF - guessing master cylinder front/rear..
Anyone know which is which on master cylinder as I guess it won't be labelled!