Engine mounts may be replaced, but must attach in the factory
location(s) without additional modification or changes. Engine posi-
tion may not be changed. Hydraulic shock type rear engine locators,
or bobble struts, may be replaced by manufacturer’s performance
part or aftermarket replacement part. This part must retain factory
dimensions and attachment points, including factory design. (Ex-
ample: If factory locator/bobble strut is gas or hydraulic piston type,
replacement part must be gas or hydraulic piston type.) If one or
more non-OE engine mounts are used, 15.10.K does not apply and
a torque suppression device may not be used.
I'm guessing the "including factory design" bit excludes replacing a 2-piece cast iron motor mount with a tubular steel, 1-piece mount, but there's no harm in getting other opinions. This question particularly concerns the Spohn motor mounts for the 4th-gen F-body (see here http://www.spohn.net/shop/1998-2002...ounts.html ). What's the community interpretation regarding these parts?