It all depends on how far back your rust goes. If it's swiss cheese behind the front of the seat riser, you might be better off with a full floor. I went with L&R floor/toe panels and fabricated some of the floor behind the front of the seat riser from flat metal. I may have been better off with a full floor, but freight costs were a consideration for me.
The L&R floor/toe panels had some fitment issues as Kevinski noted, with bead lines not matching well. Full toe panels may be available, which might work for you.
As with any patch panels, expect to have to massage them to fit.