Could someone please tell me what size the tire valve stems are in a stock steel 1999 accord wheel, I have several on hand but they are too large it seems. Thank You.

 

Original part # 42753-SB8-661 ~$1 from the dealer.
If they are hard to install use a bit of dish soap to pop them in.

 

Thanks for the info, but I need a longer valve stem, so I need the diameter of the stock valve stem, I will try to use calipers to measure the hole, but may not be successful, I am going to have to go to a parts store in my area, I am 90 miles from the nearest Honda Dealer. Thank again.