Are the 2017-2018 IS300/350 Fsport bumpers compatible with the 2017 Is200T Fsport? Found a used one my color for cheap so hoping this will save me some money.

 

Yeah, all the 3IS 2014-2020 can fit the same bumpers (even F sport & non F sport can swap). I believe 2017 was when the facelift happened so the headlight design was changed, so a 2014-2016 would have to do a headlight swap. In your case, you should be fine pulling it from a 2017-2020 IS. Just to be safe, post a pic of the front of your IS so we can see the housing for the headlights

 

What about rear diffuser (14-16 vs 17-20, not considering the exhaust tips)?

 

Direct swap as well

 

Thank you!