Spindle help

I need drop spindles for my Bus. Its a 2000 GMC according to the ownership. What has me concerned is 2000 was the change over time frame from a OBS to an NBS and I wasn't sure if someone would know what spindle I would need. I am pretty sure a Belltech 3700 is the one I need. The bus is a 3/4 tonne. Any of you GM guys know better than I do or can confirm my thoughts.

Thanks

Pics of your spindle will help. Even if its still on the vehicle

Heres the best angle of the spindle I could get if that helps. I'm 99% sure its a OBS chassis so the Belltech 3700 should fit.

Looks like the 88-98 chassis to me