My guess is that the aft end of the right engine carrier must mount
where the p.s. steering resevoir sits.  I had to use an angle grinder to
remove mine when installing the right carrier.  I don't know about the
coolant tank.  I just cut my airbox stand off and installed the
wasserboxer tank and bracket bolted to a piece of channel stock bolted
to the firewall.
-Dana-