Their solution looks like that:
https://a.d-cd.net/9837299s-960.jpg
https://a.d-cd.net/6437299s-960.jpg
Don't know what is todays price, but you can contact them directly via the web page or/and what's up number there.
Looks like a very neat install. Only thing I'd be worried about is cooking the Davies Craig waterpump (mostly the plastic housing) with the exhaust manifold also quite close in that area.
Would probably need some very good heat shielding/insulation around it to keep the waterpump alive for a decent time.
I guess the alu version of the Davies Craig is bigger, so might not fit in such a way.
Bye, Arno.