Rear view mirror dimensions

Because I do not want to pay for the excessive amount of the genuine mirror market for me,
Searching find different types with different dimensions.



or this one



Can you help me by measuring the distances between points (ab) and (bc)?
(you do not need to be precise with millimeter accuracy. )



Thank you in advance.

Hi Duckrider,
I have just measured my mirrors. I make the sizes a to b 15 cms and b to c the same,15 cms.
The temperature here tonight is 0 degrees C.
I hope it is warmer where you are.
prah.

Hi, Peter

Thank you very much for your help.
Now i will know what to look for.

Here we have rainy weather and yesterday we had hail.
I do not know whether climate change is blamed but the weather has changed in recent years.
Temperatures are from 8 to 14 degrees