I was hoping to use the massive 80A alternator from my Mazda MX5 donor, but once I had the steering shaft was in roughly the right place it was clear that wasn't going to happen. I read the Facebook group posts on it and there were many suggestions. Some apparently made the large alternator work, but perhaps my tolerance for clearance is different.
So I sold the Mazda alternator and took the easy / expensive option of the offering from GBS which comes with a shiny alloy pulley. It works with the standard drive belt from the Mazda (865mm length if memory serves), and due to its diddy size (only 45A I think) the clearance to the steering shaft is more than ample even if I end up spacing the steering rack upwards. I could use a shorter belt in future to tuck it even closer to the engine.
The only bit of real work was making an adjuster bracket. I tried using the old one and adapting it but I wasn't comfortable with how much material was left. So I made a new one... Despite doing a whole materials module at university as part of my aero degree, I made a bad choice in using stainless steel. I got it to work in the end, but was hard work and made quick work of my drill bits......
Anyway, here it is....
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From below all torqued up
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