mud guards

[Burn out Bob]

Looking for advice on a pair of mud flaps for my 2004 sport trac XLT. I installed a set of I-boards on & the front end is just square. I would like to put a mud flap on to butt up against the end of the 4" I-boards. Has anybody done a like install? A picture or just some good advice would be appreciated. I don't intend to spend $50.00 for set either.
Thanks,
Bob