The green Volvo manual is pretty good. The hardest thing is getting all
the pistons out at the same time. Do NOT split the calipers where they
are bolted together if you can possibly avoid it.

Note that only one of each pair of shoes is lined over its whole length,
so if it looks like it might have been made that way, it probably was.
However pieces missing from the middle are strange. The missing
area is about 1 1/2" in circumference at the top of the front shoe.
4 mm is quite a bit of lining, especially if it is bonded and not riveted.
If the lining is in good condition I'd go ahead and use it. My guess is
that it wasn't much over 5.5mm when new, if that thick.

There are only 3 pp in the 122 manual that apply to the calipers so
I could probably scan them for you if you are not in too big a hurry.
If I can't do it today it will be Friday night or Saturday.
E-mail me offline at gdowns@cableone.net
--
George Downs, The "original" Walrus3, Bartlesville, Oklahoma