Pottsy is right
I did check this out first
, the fuse is 7.5A, there are a total of 8 x 5W bulbs, resulting in 40W, this is about 3.3A. So there is no problem adding the extra 0.8A
This is how the connector looks like: bought it from the dealer incl bulb for 9 Euro (if I remember correctly).
Here also a picture of the hole you will have to make.
First make the round hole (use a vacuum cleaner while drilling), then carve the 4 notches. afterwards vacuum the light for leftovers.
If you want to come over to my place in Geraardsbergen I am willing to help.