2wd/4wd tri-y's

[tahoe.mkIII]

found a set of thorley tri-y's on CL.no part #s, but after an extensive google images search and compare session ive come to the conclusion that they are for 4wd obs trucks(p# THY-301Y-FED-C).i have also learned that the 2wd thorley tri-y headers will definitely not fit on a 4wd truck(b/c of transfer case clearance)...so, that being said,

do you think the 4wd headers will fit on a 2wd vehicle?

i have also seen a few statements regarding a difference in the exhaust setup between the 96-98 and 99/2000 obs tahoes.ie... http://www.fullsizechevy.com/forum/...ce/exhaust/129970-98-99-obs-differiences.html