First production 3dr was built in Feb 86, (all cars before that were prototypes) they then trickled out until June then went full swing at about 300 cars a month and rising through to December 86.

Most RHD cars were made at the end of the run.

found this in a book I have on Sierras

The 3dr used on the Homologation papers for the 3dr is actually on a B plate