Hi Terry,
Any coils available will be around 60 years old, for reliability I would use a suitable modern 12v coil and you can easily make up normally HT and LT leads to it. There is a tendency now to fit normal spark plugs and change the screened leads to conventional 7mm HT cable. The original type plugs if found are expensive and do tend to foul, where as modern plugs have a wider heat range, more available and a lot cheaper. This all increases reliability and performance.
Getting into a Dingo if of a larger size, that is long in the leg, etc is not easy, but once in there they are a cracking little vehicle and years ahead of their time. They spawned the transmission layout designs of all the Alvis 6x6 range as well as Ferret and Fox.
The reason the seat is at an angle is mainly so the driver can see out of the rear hatch if caught in an ambush and has to slam it into reverse, with seat in lowered position.
I am current rebuilding a Dingo engine and will be changing the flywheel seal and will send you the seal details as you should get it from a normal bearing stockist locally. To access, the engine and gearbox has to be lifted out as one unit, entailing removal of petrol tank, bulkhead and some flooring, not a quick job but an opportunity to check out and other problems and give it a good clean up.
Good to see it out again.
regards, Richard