THANK YOU Guzzler! You saved me hours of research!Finally pulled the trigger on non-rfts and spare: Full size 28.18" diameter vs spare 27.98".
Part number 42611-08111: (92$ shipped)
(parts link edited because it was labeled as spam)
Kumho spare: SPARE TIRE T131 - SIZE: T155/90D17 (100$)
(tire rack link edited because it was labeled as spam)
FYI, I am a sienna n00b, but a season automotive veteran. Just picked up a 19' XLE AWD, and my first task was to find a spare... ?