Anyone know the part#? Cant find it anywhere.

 

Not sure if a 97 and 99 are similar on the P/N side, but for the rear pinion bearing, I have 02852731, and the front is 01820552. If you do a little searching on the net, you can find a parts book PDF for your truck with the applicable P/N's

Edit: these are factory PN's btw

 

You try rock auto ?

 

Yeah they only show it for national. I found it on eBay by cross referencing the part number with autozone. Plus it was 32.99 vs autozones price of 46.99