For what's it worth nowaday's my comment is that these starters are bugger. For a period of nine years i drove about 50.000km a year daily with a dolomite and had three fails of these within two years. I did want just as you more reliability but it was the opposite. The denso starters are very good but the problem is that when they are modified to the hi torque power blah suitable for Triumph the contacts and the coil are replaced by boogie woogie chinese repair parts and that causes the fails. As all parts it has to be as cheap as possible. I think when they leave the 20 year old original toyota relay on it and only fit the adapter plate and the gear wheel you have a better starter than what they make of it now. When you drive 300km a year with your dolomite it will be a perfect replacement but for daily or motorsport it is as unreliable or even worse than the original.
For many years i use and more in Holland a modified modern bosch starter what is a slightly modified new original bosch what does last normally for 30 years and 500.000km. I do not know the type but it is 1,7kw as to the original lucas of 0,7kw. A friend of min does work at a starter motor company so can compare and switch parts and he does make them for me. They are twice as expensive as the average high torque but do not fail.
that is very helpful to me.
I have been thinking about fitting a Hi-torque starter for a while now because I have had two reconditioned Lucas starters that only lasted for a short time.
Currently I am using a new old stock Lucas starter but before fitting it, took the precautions of wrapping the exhaust manifold and also fitting a Lucas solenoid heat shield.