1971 series 3 109 wing mirrors, overdrive and side step

Hi

I have a 109 series 3 that has mirrors on the wings, I was wondering if you can get any better ones, maybe to use the hinge mountings, as I don't really want to drill additional fitting holes?

Secondly, is there a suitable side step, to go onto the drivers side, due to a bad back, it causes me problems getting in and out? How do these fit on?

Lastly, what is involved in fitting an overdrive, and how do you get hold of the unit?

Cheers

Dave

I've got hinge mounted mirrors but I don't know where you can get some.