You should examine the case before you just stick a new bolt in there. You might want to consider this fix: http://www.gowesty.com/ec_view_details.php?id=4454&category_id=&category_parent_id= 

Stuart

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of john
Sent: Monday, June 01, 2015 5:44 AM
To: vanagon@GERRY.VANAGON.COM
Subject: '84 1.9, lower bolt on alternator mount

I have not had to ask question on this list for months as failures since major work in 2003-2004 have been minimal. After hearing strange noise from belt that does alternator and water pump, I ttok a look at engine compartment and found that bolt that holds alternator bracket to right head had fallen out.  What size bolt is this?

Thank you,

John