Help needed throttle sensor question

So I just got a P0121 throttle position sensor 1 engine code.

Problem is I look online for 2007 Silverado throttle position sensor and it seems they're are lots of sensors all looking different to each other so how do I tell what's right.

I could try the dealer and wait a couple of months give them a kidney and my first born

But I'd rather not

So how do I find which one is correct?