Chrsboy,
Wow that is a special car in my opinion. Lots to unpack here so let's get started. When Roush started production on 12/21/04 they made the first 90 cars (12/21/04 - 01/20/05) were ALL sport Roushes. Then on 01/26/05 production started again but this time they ran 45 Stage 1 cars (note 2 Sports randomly during this stretch). This occurred from 01/26/05 - 01/31/05) then a new batch of Sports started. So I think they needed the Roush wheels and this is why they ran the Sports at the beginning (this is my speculation). So Roush car 136 was the 10th Stage 1 car made.
Here's the details:
Build date (born on date) 01/27/05
VIN: 1ZVFT82H555123500
Stage 1
Forklift holes - Yes
Stock leather interior
Sonic Blue (SN)
Obviously all the items you list have been added over the years: supercharger, dress up under the hood, coilovers. Basically a Stage 1 is a stock mustang GT with a body kit, quarter window louvers (optional) Corsa Mufflers, and 18" Roush wheels.
Yes all Roush numbers up to around 1175 have forklift holes. From my research 1171 has forklift holes and 1176 does not so bottom line there are between 1171-1175 cars with forklift holes. For sure Roush numbers over 1176 DO NOT have forklift holes from the factory.
Hope this helps.