Voltage Regulator/Ignition Module Firewall Bolts

Does anyone know where I can get some Voltage Regulator/Ignition Module Firewall Bolts? Or the size and threads per inch, so I can buy a substitute.
The ones on my truck and Ramcharger are too short to include a lug with a wire that goes to ground (just to make sure).

Also is there a recommended Voltage regulator and ignition module? I have been using Echlin TP51's for Ignition modules and the black muscle car VR's.

Any help would be appreciated.

Thanks
bwhitejr