I was looking at the postmount adapters for the BB7 if used with 185mm rotors and the description says 'front'. None available that says 'rear'. I know that for IS 51mm, the adapters is dependent on whether you use it for front or rear. Is this the same case with the 74mm postmount? Or am I correct in thinking that the same postmount adapter actually works for both front and rear installation?

I have 2 BB7 with 160mm rotors - for front & rear, that is on backorder for quite a while now. The 185mm appears to be on stock so now I'm thinking why not just 185mm for both front and rear but I'm not sure if 185mm will work on a postmount rear brake using the same adapters as the front.