Anyone know the size of the cup holders in a boat im thinking about buying new ones but the boat is at the lake...

I think there are two sizes, wakeside sells two sizes of the stainless 3" and 3 5/8"

What boat do you have?

From past threads about this I would get these. Old threads made it sound like most are 3 1/2 to 3 5/8. These would work good. They come with a gasket apparently that has adhesive. <BR> <BR><a href="http://www.iboats.com/Stainless_Steel_Recessed_Cup_Holder/dm/cart_id.715183801--keywords.cupholders--list_time.1211910399--session_id.024603387--view_id.341913" target="_blank">http://www.iboats.com/Stainless_Steel_Recessed_Cup_Holder/dm/cart_id.715183801--keywords.cupholders--list_time.1211910399--session_id.024603387--view_id.341913</a>