Hi "Flo" hopefully you still have the little collar piece even though it broke.
Unfortunately you may have an unbelievably hard time looking for that replacement. My coach is a 2001 with the Dewald/Power Gear pump manifold. Too old to get parts or support for them anymore.
That said if it the little collar piece that attaches to the end of the 12volt motor to the hydraulic pump you might find it easier, quicker and even possibly cheaper, taking it to a local machine shop (your mechanic should know a good one,) and ask them to cut you a new one.
FYI, if you replaced the motor with the Amazon one recommended on this forum, be very careful on the alignment. The motor shaft on the Amazon replacement is a centimeter or so shorter than the original Dewald /Power Gear motor (at least it was on mine).