best type of mate for attached screenshot?

Hi All,

What is the best sort of mate to use to specify a distance from tip of mitered pipe to the outside face of the spacer?  I originally had the end of pipe cut square so I use the distance mate since both faces were parallel.  But I've since put a 45 deg miter on right end of pipe and now cannot use the distance mate since both faces are not parallel.  Not that familiar with the different types of mates.  Thanks.

SolidworksAssemblies