Bolts to attach moss gearbox to bellhousing (E-type S1 1963)

[fredmec00@hotmail.com]

Just finished a major engine overhaul. I was planning to put the engine+gearbox back in the car.... but I am now facing issues with how to attach the bellhousing to the gearbox.

The holes threaded in the face of my moss gearbox are not UNF as in the well know all-synchro transmission. The parts catalogue fro 3.8 until 61-63 have the following numbers for the bolts:
6x FB107/13D
1x C9859
1x C9860

SNG Barratt, DMG say they dont supply it. SC Parts claim the bolts are the same, but they are not the ones from all-synchro wont fit!

Does anyone know what are they? I am tempted to helicoil them, but I feels like a crime! Any tips of other suppliers that may have pre-historic bolts?

http://tinyurl.com/oh7pdtb
http://tinyurl.com/pofjog3
http://tinyurl.com/oq6oqso
http://tinyurl.com/qy3xn9w

Thanks,
Fred

[christopher storey]

Are you sure they are not UNC ? Nearly all the bolts which go into alloy are UNC. Failing that, it is just possible that they are Whitworth

[fredmec00@hotmail.com]

I got a thread gauge and found the hole is threaded with Whitworth 18 G 5/16

Where can I get in hold of those?

Cheers,
Fred

[christopher storey]

Fred : if you are in the UK try one of the fastener specialists such as Namrick, or a local engineering stockist . Whitworth is still more common than one might think , as most UK heavy engineering used it