Perhaps the elusive hose clamp holder is this one?...
p/n 64216918118
(#9 in the bottom right corner)
http://www.realoem.com/bmw/enUS/show...77#64216918118
I think I would just go to a dealer with a print out of your PPK aux cooler & hose... and see what they can come up for you.
Good Luck
Dackel