Do the oem mud flaps bolt right on or is drilling required?

So I asked my dealer to install mud flaps on my brand new TRD Offroad. I payed for the flaps but the next day they told me mudflats only fit the painted sport fenders. I'm certain this is incorrect after everything I've read on here. I'm going to purchase the mud flaps and was wondering how hard they are to install? Will they require drilling or will the bold on to pre drill holes? I think it's ridiculous that the dealers are giving information that appears to be so wrong. They also told me my 2013 tube steps wouldn't fit but I insisted they try and they did fit.

 

I put Weather teks on an SR5 today and could have done it blindfolded, seriously. A few bolts on and off and you are done with all 4 in 15 minutes.

 

Pretty sure no drilling is required. The screw in plugs in the fenders

 

Your dealer is brain dead and very incorrect. I hate it when sales people don't know about the products they sell.

 

They require four bolts and the truck already has the holes in the under-fender for you to attach them to.