[Spridgets] Bolt thread size pillar to body

[Dena & David Vrba]

Hi Listers,
Quick one.
What is the thread size of the bolts for pillar of  windscreen to body on a 
'62 sprite?
My best test is the bolts are 5/16" but not clear if they are UNF or BSF. 
My thread gauges tend to tell me they are 24's but a 5/16 - 24 die does not 
work well on a removed bolt.

UNF = unified fine  60 degree inc angle and 24 TPI
BSF = British Standard fine  55 degree inc angle and 22 TPI

David
Corona, CA
'62 Sprite MKII