Problem with axles fitting in cone suregrip.

I've got a narrowed 8.75. I had the open 2:76's replaced with a cone suregrip and 3:91's. Now my axles will not push in all the way. The driver side is about an inch too long and the passenger about ½ inch. The retainer plate on the driver side is nowhere near able to bolt down and I can get the passenger side started but they won't run all the way in. Hopefully I'm just missing something here and there's just a minor issue.