At 40x50, those baskets are to wide. My basket is 39x44 and that's pushing it for a Ranger roof.
Thule is the route I took for a roof rack since it was the most versatile I could find for everything I'm into. ie: biking, hiking, kayaking, skiing, etc.
TK14 bases, 430 feet and LB50 load bars make up the rack. Just about any manufactures accessories will mount to this set up but all the crap I have is Thule.
When I don't want anything on the roof, the feet and load bars come off so all that's left is the TK14 bases.
What ever you use to create the roof rack, I HIGHLY suggest you choose a square load bar.