E38 Webasto retrofit?

[SupaFIN]

Hello,
Sorry i speak only (bad) English but have to ask if someone can help me.
I have 740iA 1999 and I'm going to install Webasto Thermotop Z/C. Webasto is from 2001 e39 so it is bus controlled, no problem at electronics. But I'm curious about how it's mounted in e38. If i understand right, it has same "carrier/hinge" that in e39, whatever that name is, but how's car side? Is car body "carrier/hinge" welded or bolted in car. I have troubles of finding that car side "carrier/hinge". It would be great if someone have pics at stock webasto installation in e38. And also, how waterlines are routed to engine bay in stock installation?

Thanks and hope someone understand me.