Looking at the Fluidampr website for the various 6.2/6.5/Duramax models:
http://www.fluidampr.com/DURAMAX.htm

This conflicts with what is on the Diesel Page article website:
http://www.thedieselpage.com/features/fluidampr.htm

Fluidampr website lists #800191 for '82 to '87 6.2 engines and #800141 for '88 to 2000 6.2/6.5 engines.

TDP article lists the #800191 for 6.2/6.5 mechanical injection pump engines and includes a spacer to make up for the reluctor wheel while the #800141 is for the electronic injection pump 6.5 models.

Is this correct?

Is it also correct that the only difference between the two part numbers is the inclusion of the spacer in the #800191 kit?