7.25 and 8.25 axle shaft interchange?

Okay, asking for help here on this rear. I have posted for used 8.25 27 spline axles, already have the housing, will buy new sure-grip, gear, and replace all the bearings. Cannot find any new, rebuilt, or used 8.25 27 spline axles. Soooo, since 29 spline are available, could I go with the 29 spline center and buy 29 spline axles? They are available if they are the correct length. What do you think?