Help a newbie

I finally got my Mark I in the shop and started dismantling the beast. I have made only one grave error so far. I did not realize the bolts that hold the rear axle to hull were special. These are the ones that support the brake backing plate on the ends. So, I need to find someone that has these, as mine are now destroyed. Anyone help?
What about wiring harnesses, any help there? I have made arrangements to have them made, but would gladly look at alternatives.
I also found out that the speedo drive gear has a number of missing teeth, so if anyone has one of those, I would love to purchase that too.
I will undoubtedly be bothering some of you when the reassembly starts. The linkage/measurement section has me scared.
Regards,
John Bizal