Not in the booklet- three GT5-S cars were factory-converted to Targa type tops. Of the 3 known Targa-Panteras, two were built with Getrag 6-speed transaxles sourced from the Audi RS-2. One is Austrian Franz Krump's 'cirrus-blue' Targa-Pantera; the other is a yellow Targa in Switzerland). A single non-Targa GT5-S was also equipped with a six-speed Getrag. A 3rd Targa-top GT5-S apparently had a std ZF 5-speed.
I think you mean Si and not GT5-S ?
from what I remember there are 4 Si Targa's . 1 red, 1 blue , 1 yellow and 1 gold painted.