I know they are wider than the 3100, not sure about longer, however here is a pic of a big-bolt front clip on my 3100. pic

I got the clip for a good price and it matches the parts I picked up for Frankentruck. The wider fenders will help cover the wider tires I plan on running.

The problems we face today can not be addressed at the same level of intelligence we were at when we created them - Albert Einstein Or with the same level of $ - Me