Don't the solenoids just flick the bendix out? Thus justifiably same size??
That's correct.
Yes a mk2 start will bolt right up to a mk1 but the wiring might be slightly different. Nothing serious though.
On a Quantum, putting the 2 starters side by side looks like father and son. Diesel one has to be twice the weight...
Yes the diesel starter is more powerfull, but the solenoids are the same.
Don't the solenoids just flick the bendix out? Thus justifiably same size??
Yes, the reason I mentioned this is the diesel starter is hard to find over hear. All that was wrong with mine was an overheated terminal post on the solenoid. The supply of the s/h petrol version is quite plentiful & got me going again.