I have a stz671mhfba that needs a new tip and I was wondering if anyone knew which exact tip they use? There are a couple titanium ones on mud hole but I'm not sure which to get.

You need the tip measurement in 64ths of an inch or mm then match the ring size to the smallest running guide which is the id of the frame ring (not the insert) in mm.

I'm not worried about the size, the model is what I want.

Email Daiwa with the model # and they should send you one or at least tell you which one to buy.

It's a standard Fuji Ti-SiC. Looks kind of like a TFST from pictures, but hard to tell.