hmm.. all of the tractors here are earlier than 20381, but looking at the parts book TC-100 revision 9 issued 2-'71, the later rear frame, 390965r21 also calls for 2 of 444788 plug, 1/2-14 auto sq-soc pipe and 1 of 9409949 plug, 3/4-14 auto sq-soc pipe whereas the earlier rear frame 380361r21 does not. here's another puzzle- the note under 380361r21 reads: order frame, 390965r31 & two cases, 392075r1
notice the part numbers. it wasn't a change from r1 to r2, it was a different number. the way the system works is a change from r1 to r2 of the same number means the parts are interchangeable but updated.
as for your problem, it doesn't seem like IH to change the bolt pattern for no good reason, but you never know. are you SURE you got the right lockout brackets? the ones i've got have 4 holes but you only use 3 and i think you can rotate them any way cause it's a square bolt pattern.
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