The pair you are buying here is fully assembled and will arrive with the spanner wrench as shown in the first two pictures. You can remove the air-cooled structure and place it on subsequent sets of plugs over the years as you use up the plugs. Quite a neat idea!
Used from 1909 to 1947 on Single, Twin, Sport Twin, J, JD, F, FD, Pea-Shooter, JDH, VL, VLH, VLD, Knucklehead: E, EL, F, FL, ELC, ELA, Big Twin Flathead U, UL, UH, ULH, UA, 45 Solo: RL, DL, W, WL, WLD, WLDR, WR, WLA, WLC; Servicar G and GE.