Bought my 05 R1 used and it didn't have a fender or limitation kit.
I'm currently in Germany now trying to get my bike to past inspection, and trying to install the stock fender that I just got of ebay.

My question is: What size bolts goes into the 4 holes in the back to hold the fender in place?

I did a search and didn't find anything...

Thanks in advance for anyone with info.

Did you ever get an answer? I would like to know

The correct answer would be whatever fits.... Any 10 cent bolt and nut should work as long as it fits through the holes:fact

He means the actual bolts holding the bracket to the bike itself, not the plate to the bracket.

I dont remember them bring threaded... even if they are, just get 1 size smaller and use a nut