I was going to say that the EGR hole in the header is an M22x1.5 but someone beat me to it.
But for those that are real cheap like myself, you can the block off plates off gen1 and gen2 Rangers with the 2.9 and some gen1 Explorer 4.0s.
FocusXtreme - Hatch Nation #96
04 ZX3 5.0, T5, 4 lug 7.5 w/ 3.73s [3/13 ROTM] ["Best Non-SVT" FITF '12]
12 SE Hatch Sport & Winter Package, ST Front End
91 Ranger XLT 3/4 drop
89 Bronco II XLT Well the body is still stock, what's left of it
97 Mountaineer 5.0, AWD, 3.73s