Tall Firewall
Beveling at bottom edge of Firewall.

No Transmission between Engine & Firewall
Tall Firewall with beveling at its base

Underside: (Blue) Vertical tab
(Red) Engine cavity on both sides of Tab

Underside: Long rails on either side of engine cavity
Half of each rail has been reduced in height

Shows the Tab & Rail heights and both cavity depths
Very similar to a standard HK body