Broken Pump Impeller - Need a new pump?

My motor was humming but not spinning when turned on, so I took the pump apart and found a broken impeller. This is older Swimquip unit, probably installed in the late 80’s. Is there a replacement impeller that is available for my pump? If not, what pump would you recommend? Perhaps something that I could keep my existing motor as a backup.

Pool is ~16k gallons, indoor lap pool. Sand filter and heat pump that needs 15-50 GPM. Current pump/motor was giving me about 35GPM.

Thank you!

Looks like the impeller is discontinued.  Is there a replacement pump that you would recommend?  Thanks!