I mentioned "for the most part" and here is an example
Do you see the pattern?
If it is a general type bolt the diameter and length are in the part number. If it is a Kawasaki part number the diameter and length are specified in the description.
So far it has worked great for finding replacement bolts/screws ate the hardware store
Patriot Guard Rider
2000 VN750 Sere (Serendipity)
1990 GL1500 (Ole Blue)
1986 VN750 EVie (project bike, heavy custom)
VROC # 11628 / 25000-H
ARVROC # 12 Coordinator and Crowd Control
OKVROC # 18 (H)
TNVROC # 45 (H)