A couple different needle seats are available for the LMT carb. 690577 is for most of them with a different 691901 for the 5 and 6 LMT models.
690577 SEAT, Inlet
691901 SEAT, Inlet -(LMT 5, 6)
Just wish the needle was available for that $450 Honda ATV carburetor I just replaced. It was leaking both at the needle and around the carburetor body. No repairing that carburetor without replacing the seat. Initially it was only leaking pass the needle which I took a six flute counter sink bit and cleaned up the seat. It sat on the ATV for two weeks and no leaks. Then I took the ATV for testing the brake and fuel just pored out when I got back. When I retested that I found the seat leaking around it outside to carburetor connection. Must have some gunk around the seat that the fresh gas dissolved.