The 282 Wilwoods will fit under 15s, they may require a very small spacer to clear the caliper from the spokes but that depends on the spoke desing. The 300mm versions won't fit most styles of 15" wheels.
I would recommend you to read this thread below before ordering from Tegiwa: http://www.civiclife.net/board/topic/122256-tegiwa-imports/page__fromsearch__1
When aiming for high power it's important to have everything balanced together instead of individually Nice update Dale, I look forward to more updates!
If the SR tailgate fitted fine then I can't see why the Glanza one doesn't. I only removed it from my SR less than 12 hours ago too! Have you bolted the boot tensioners in tight?
It's all packed up now! I could send it from the PO for a couple of quid though let me know if you need one at any point. They are Wossner 74mm used pistons from an old build.