mid-lifecrisis

hi
I've dinged my rear light. Ordered one of ebay, and the guy cut what I think is the indicator lead. I've read loads in posts how this the connector for this lead is hidden behind a piece of foam.

Anyway, I checked the manual and it says for changing this part of the light you need to send it to mazda. I've run through the forums, done the google search of the forum and watched countless videos of you tube but to no avail.

So my question is, is there any instructions anywhere to enable me to take that lead (the one to the indicator / marker light) out of my current dinged light and put it into the second hand one which has had the wire cut off?

thanks