The EPC will find it.
The first Box ,before you plug in ANY VIN # ,gives a pull down menu ,
select MD mode,
then select 1.car
and then find the chassis and Investigate from there.

You're "Walking Back the Cat"

If you are in the "Dark" as to ratios and models, GSXR has posted at least once.

P.M. him.

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'84 300SD sold
124.128