What are you talking about? It's all there man!
https://www.wtb.com/pages/resources
Maintain and repair(Lists part numbers for hub)
https://cdn.shopify.com/s/files/1/0202/9884/files/ServiceProterraSpeedterraHubs_20190326v3.pdf?651
12x148:
https://cdn.shopify.com/s/files/1/0...eedterra-Proterra_12x148_6B_explosion.pdf?651
12x142:
https://cdn.shopify.com/s/files/1/0...eedterra-Proterra_12x142_6B_explosion.pdf?651