Cabbie Rear Brake Conversion to Disc (1982)

I'd be most grateful for help in clarifying some aspects of a conversion from drum to discs on a 1982 Cabbie.
I've haven't been able to find any images of the mounting bracket used for a conversion between the old style compensation valve for drum brakes and the new Mk2 regulator supplied to me as part of the conversion kit from VW Heritage.  I'm not even sure if I have figured out the correct orientation for the new valve.
I list photos showing the two brake lines from the base of the old master cylinder which link to the load compensator valve.  Next photo is the old valve shown alongside the new valve, (part #357-612-151).  I have placed these together in what I imagine is the way the one replaces the other.
Also are photos of the pipes from the master cylinder where they terminate at the mounting point for the old regulator valve.  Finally I have a photo of the rear axle connection point which previously carried the bold for the valve spring.
I also attach a schematic from partsbase.org, which indicates how the brake lines enter and exit the load compensator valve and connect to the  rear brake calipers.  However it does not show which of my master cylinder ports is connected to this valve.
Can anyone advise me which port from my old master cylinder is connected to which of the two bottom entry ports of the new regulator valve shown on the schematic?  Does it matter which way round they are connected in the sense of are they a "flow and return" system?   I cannot tell that from the schematic, as my master cylinder is the original and does not match the one shown on the schematic.
I shall be making new brake lines as necessary, so I am not trying to match the old brake lines to the new regulator valve.
Unfortunately I don't live near anyone who might have already done such a conversion.  It would be great if someone could point me towards a reference with photos and an explanation!
Perhaps if someone can answer this it will help others, as this is a conversion which is often recommended.



 

Having trawled through the various sites referencing brake pressure regulators, I believe I now understand more clearly how the system should work.  The system is  straightforward as long as I keep the connections from the master cylinder rear brake ports into the new regulator as shown on the schematic.  I reckon I have to reinstall the axle, brakes and wheels under normal load and then measure up the bracket needed to position the new regulator and spring correctly.  Then I'll probably have to remove everything to get access to run the new hydraulic pipes.
I'd be grateful if someone could advise me if I'm correct, or if there is an easier way to do this conversion, (other than using some type of in-line regulator to avoid all this complication?)

Just found a post from the inestimably helpful rubjonny!
This link should take anyone interested to it.
http://vwgolfmk1.org.uk/forum/index.php?page=topicview&type=findpost&id=1053873

the correct way to setup the bias valve involves pressure gauges hooked up to the calipers, so not easily DIY! my way is to just set it so the slack is just taken out of the spring when the car is on level ground, its worked on all the cars I've messed with

I'm surprised no-one has started making these brackets yet, so simple to produce and pretty fat profit margins to be had