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Since I already have vented 914-4 calipers in my car, number 3 and 6 are probably taken care of.
What is the "911 Rear Pad Spring Kit?" Is it already there?
The cores we used for the GT kit had springs so I had them plated and refurbished (riveted). You're all set there.
3 and 6 are rotor spacers and longer studs. If this is a GT clone you may want to take this time to install the 72mm Verbus studs in your hubs and use the open lug nuts. I'm not sure how far you want to go for the sake of GT appearance.
Regarding the rotor spacers. I believe we decided that you were going to attempt the spacers underneath the caliper ears (which I think is what you had). If that didn't/doesn't work we have the rotor spacers to go that route. There are two ways to go about it:
1. Space the caliper 5mm off the ear moving the centerline back to align with that of the 911 rotor.
2. Space the 911 rotor out 5mm to move the centerline out to match that of the 914-6/GT caliper. This is sometimes the only option because the 914 based calipers come 'very' close to the trailing arm.