rear coil bolt's size
 

anyone would know from top of their head, whats the size of rear coil bolts on 01? I was changing plugs yest. but dropped one of the bolt with visor behind engine and it didnt fell at bottom. I really dont want to go open other bolts to compare size.

It's got a 10mm head, and the bolt is about an inch and a quarter long.

You'll also need to know the thread pitch....which I don't. Pull another one out and match it up at your local hardware store. The coil should stay in place for a short while without the bolt.

When I replaced mine I stuffed some 2-sided tape into the socket so that the bolt wouldn't slip out.

M6 x 1 about 20mm long should do the trick