the needle fits into the cart, the cart is fit to the headshell, which fits to your tonearm you have to get the right needle & cart & headshell for the Style you spin & the set-up your have are you going to do a lot off Scratch..??? are you going to be using a DVS [ time code vinly ] ??? what style are you playing ???? for my turntable set up I use Stanton Scratchmaster MP4 pac.. *Image removed by admin because it was fucking huge*