bachmann ge 44 ton loco

[indian_hills_r_r]

I just purchased two sets of wheels for my ge 44 ton. it turns out they are, what is called third generation. they look like the stock wheels that used to come with the engine but these have a bronze color square block of metal on each side of the gear on the axle.

my question is: do these blocks locate next to the gear or close to the flange?
thanks