Timing Cover Screws

Hi,
I need help with sizing my timing cover screws. They are in 3 lengths: 1 long, a few medium & a few short, totaling 12.

Can someone tell me the correct length and the thread size for each: short, medium & long?
Thanks,
Stephen

http://www.oldbritts.com/19_301003.html

However you can get these stainless socket head screws for a lot less at boltdepot.com, especially if you order a lot of other UNF/UNC items.

OB are a very good source however, and very nice to deal with.

Dave
69S