Will these be too large for windshield mounting? using an Olympic mount.
Size: 118 mm X 110 mm X 92 MM (4.6" X 4.3" X 3.6")
CREE is a good quality Diode and a narrow beam like the 8* you're looking at will be ok on the windshield. You want that spot pattern so you don't get glare off the hood.
They are a little bigger than the 3" Offroad LED Lights you usually see on the A-pillar, but they should fit on those mounts without a problem. Let me know if you have any other questions or would like a quote!
I wouldn't recommend ebay... I never enjoy working with ebay people when a problem arises. I would consider ^^^ or, check out Welcome to Lifetime LED Lights - guaranteed for life I purchased a light bar from them, and when a problem came up with the bar, I had a new one shipped to my doors in couple days without any questions asked...