Need help identifying pump model - pump shaft seal leaking

So my pump developed a leak last week. Thanks to TFP - I'm 95% confident I need to replace the pump shaft seal.
Threads like this really helped...

I'm reasonably confident this is a Pentair Challenger series. Greatly appreciate if someone can confirm and give me some pointers on buying a seal.

I've attached some photos.

Edit: I assume this is the part I need:
354545S Seal, 5/8 in. mechanical