what is the lug pattern on stock wheels, 5.5?

having to replace wheels on my 1999 4runner because I have the 15 inch wheels and I need 16 or 17 inch wheels to do the tundra brake upgrade apparently. Not a problem because I have ugly wheels now. I need to go with 6 lug but I am not sure about the 5.5 lug pattern. I dont know what that means. I have been told that all 6 lug Tundra wheels will fit. Not sure. Thanks

 

I hope this helps.

 

Thanks very much. I understand now. And thanks for your service!