correct snowplows for re-numbered up gp-60, b40-8 and sd-60?

i am modelling these locomotives and i notice that they all have had their snowplows changed to ones that are lower. the details west #120 plow looks correct, maybe a bit too low? if anyone can help it would be much appreciated.

Most of the plows I have added on my locomotives are a little low and that is correct for most GPs and SD10s- SD60s as I know of and even possibly SD70s and up
James

depends on on time period right now they are lower.