The NGK spark plug in my M/C is also used in 4 cylinder cars

The NGK spark plug for my M/C shows 3 different stock numbers for the same plug

All 3 of these plugs will have the same number on the plug but a different stock number on the box

1) Fixed head (head cant be unscrewed)

2) Head can be unscrewed

3) Top of plug is shorter with a head that can be unscrewed