That's an older servo.. probably has the older black Airtronics plug on it (used to say Sanwa on it).. you need to use a newer blue "Z" connector to fit it in a Spektrum receiver.

You could send it to Airtronics, but for the price you'd have to pay, it would be more than that servo is worth. You'd be better off changing the wires yourself. Check your local hobby shop and see if they have a lead you can change it too.. or maybe just look for a better used servo.. I've seen metal geared, high speed used servos that sold for $100 go for under $30 on ebay. That servo you got is basically a plastic geared, ball bearing, stock servo.

Good luck!

Jerome