I had a faulty starter motor and needed to replace ASAP with no time to get the original Valeo apart to investigate, so for speed and cost I bought one from my local motor factor (recommended by a gent of this parish, I forget who, but many thanks) made by HC Cargo which is owned by bosch. The starter motor looks identical to the Bosch one, with Bosch stickers on casing, and you can buy all the components to repair it. Has a 2 year warranty and cost £50 inc vat brand new.
Useful to have on the shelf just in case of while yours is repaired.
It seems to spin over quickly. HC Cargo are based in Nottingham and can tell you your local stockist.
Part no: 111334. fits the majority of boxers from R75, 80, 90, 100.
Type this number into their website search bar for more info and technical specs.
Hope that helps