Vic said:This is definitely the case. I have seen BOTH 4 and 5 hole 19mm bridges from Hipshot. I don't know if it's new/old or just different patterns based on OEM spec/request, but it's definitely something to be aware of if you're thinking about swapping bridges around.
I have talked to Jimmy and he has the Hipshot B bridges made special for him with 4 screw mount and 19 mm spacing that is also same spacing as a Bassass bridge he puts on his 5,s hope this answers everyone questions.