how to de-limit a jap import

[nissan_doctor]

as above lads any ideas of how to/or who can de-limit a jap import for me.i am looking to swap my e39 for a soarer/supra but as far a s i am concerned they are both stock and need to de-limit whatever i will end up getting.
another thing will side skirts for supra/soarer be the same do they have same chassis length or just same engine.
they are both 1jz gte thnx lads in advance.

As said an RSM is by far the easiest way.

As for skirts, both cars have completly different body designs although they share most chassis componants.

Engines are also not both 1jz gte, Soarers have the 1jz gte(2.5) and supras have the 2jz gte engine(3.0) Both engine are very similar and equally reliable.