For your 2007 Subaru B9 Tribeca, there is not a confirmed fit for the 1-1/4 inch hitch. Curt does have a 2" fit like you mentioned. The Curt # C13046 is the only hitch available that is confirmed to fit your Tribeca.
Because you do not wish to use a reducer like # HT02 and a hitch lock anti-rattle like # 63232 with your current Kuat NV bike rack with 1-1/4 inch stinger, I recommend you use the Kuat Bike Rack Shank Adapter - 1-1/4" to 2" # D101 which is a fit for your NV with it's integrated... view full answer...
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