Old thread so you may have solved this, but posting for anyone else reading and wondering.
One of these: http://www.brickwerks.co.uk/index.php/compensating-lever-t4-handbrake-1868.html - just goes in to a hole on the van floor rib, it'll be obvious when you look at the spring. I got a new spring and plastic spring bracket from them recently as I had to change one of my rear cables, it was sticking and holding the caliper on the disk which made for an exciting drive home - and this was the day on which I picked the van up!
Have just done the front section of my handbrake - your article was a big help thanks.
Found it easier to get the rubber boot in place in the cab by pushing it up through into the cab with a long screwdriver and then pushing it down into place to seal.