The manual says:

Cartridge EV149A (Cat. No. 5823)
Part number 33-392-0

When I searched, I found this one but there is a waiting list: http://www.turntableneedles.com/Astatic-763d_p_629.html

With that being said, suggestions on where I can buy now? Thanks a bunch, Matt!

I snapped the #17 piece in the picture called "Retractable Cartridge Bracket"...

Bobby Basham wrote:On these cartridges, the needle slides in at an angle under that metal clip and snaps into place. You should hear the "click" when it is properly seated --BB

This is helpful Bobby! So that is the cartridge right there?

Looks like an EV 150 with a missing yoke. Need a new cartridge now. Thanks, Matt! What is a missing yoke? Unfortunately, I snapped a piece off when I got it...you can see on the picture the broken piece. It is the little black arm piece that comes out of the silver part (end of the arm) on the top ...

I seem to have the same model. I am new to this...I have the player and a new needle but think I need a cartridge?! Can't tell how the needle would go in...