I have a missing Ball joint Bolt and was hoping to get an insight on what size bolt to get.Thanks

 

I assume you mean the bolts that fasten the ball joint to the control arm. 90105-12216 or 90179-12103 depending on location on the ball joint. Don't substitute this bolt with something off the shelf unless you exactly match the strength/composition of the original, this is a critical fastener.

 

What year and model is it!?

 

It's listed under his username.