Does anyone know the dimension from the back of the hub carrier to the front of the hub (where the drum mounts) on a sierra axle?

Hopefully as illustrated in the picture, if there is a picture!

I want to get started on some drawings for my de-dion (escort width) and I'm stuck at work on site for another couple of weeks and the donor is at my old mans.

Thanks in advence for your help

Craig.

It says the pictures too big?

What's too big?