OK, some info, quality of parts is very good, normally the kit is supplied with Girling master cylinders but I did some preliminary measurements and thought that things would be a bit tight.
I chose the Tilton 75 series master cylinders because the are a compact design, this combination will fit easily.
This is the company that makes them. http://www.compbrake.co.uk/Bias-Pedal-Boxes/Servo-replacement/UNIVERSAL-ADJ-BIAS-PEDAL-BOX/prod_996.html
I didn't buy the parts directly from them as I wasn't happy with their customer service, parts were purchased from these guys.http://www.pro-tecmotorsport.com/
The bits I purchased from Pro-tec are, adjustable bias pedal box with no master cylinders, in car adjuster and an adjustable rod with a clevis at both ends, cost including postage 204 pound sterling.
Master cylinders were purchased from Jegs US @ $89 ea. shared freight with a mate who was buying some parts for his XW resto project. Local price is $209 ea.!!!
Plan is to get the brakes done before Feb next year, so I will be starting soon.
I can post some pictures as I progress if your interested.
Hope that is of some help.