I have just changed my manual mirror to an auto dim type. I can confirm it fits straight onto the window mount. I have a manual mirror here that you can have for free.
To answer a few questions, yes the manual mirror is slightly larger than the auto. If its wired in correctly, using all three of the wires, it will turn off any auto dim as soon as you select reverse gear. This is to avoid the situation mentioned here about reversing out of a garage.
My new to me auto dim seems to work just fine. I have no issues with it, in fact I have noticed it dims slightly if vehicle approaches from behind even if the lights aren't really a problem. So, yes it it quite sensitive.
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Rover 75 2.0 CDTi (131Ps) Conn SE Saloon. (Manual)
160 Remap, cruise control, electric window blind, temp gauge, Real walnut / ZT interior, FBH with GSM control.
BORN
Tuesday, 5th October 2004 @ 12:35:52
This vehicle was the 104,679th 75 to run off the production line, out of 112,381
This vehicle was the 3,318th 75 CDT Connoisseur SE (135) to be made out of 4,744
This vehicle was the 12,440th 75 in Starlight Silver (code: MBB) to be made out of 14,280 Starlight Silver 75s
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