I'm upgrading my tb from stock to a 74mm tb. A trusted friend in our xf clan gave me part #a1121410125. So I ordered one off eBay and came in today and I search thru the xf forums to find the part #a1131410125 being recommended for the upgrade. Is there a difference between these two parts? And since we are on the subject I'm assuming I need to get an oring for the 74mm tb and maf housing? I don't usually work on upgrades to engines much other than k&n filters so Im just needing to know what I need to do in order to do this correctly and professionally. Thank you in advance for your input

 

The difference is that the 112 number is what you have already and the 113 number is what you want.
The complete numbers are here.