Doug,
None in Jinja. Called my parts guy in Kampala, wish you could have heard that conversation, ha! Between his broken english and my broken Luganda, we might be in luck. He ended up asking if they could come from a 4JG2, so I assume he's on the right track.
Anyways, he's putting the 8 bolts on a taxi to Jinja this afternoon. When they get here, I'll measure them. There's a good chance they are what you're looking for because he's wanting $6 each for them whereas most bolts are pennies.
When they get here, I'll measure. If you've got an igadget, i can message you a photo or send one to your email. PM me the info if you want a photo.