Silly question: Always replace bearing races when new bearings are installed or no?

[Tim Ayers]

OK, I don't want this to become a huge debate, but it is recommended to replace the bearing races in the hubs when you install new bearings?

I was lucky enough to find NOS, Ford Script front wheel bearings. I don't not have NOS or OEM bearing races. I have new, National brand which are made in Spain.

The front hubs have the original US-made Timken races in them.

So the question is, do I replace the races or leave the originals in if they do not show signs of wear or pitting?

Thanks,