dana axle tube replacement help

I have an electric golf cart with a dana axle with an aluminum housing that had a differential gear go out and blow a hole in the housing.
Attachment 127147
I have a new housing and all four of the differential gears to replace the old one. My problem now if getting the old axle tubes removed from the housing. There appears to be two large rivots coming up from the bottom of the case.
Attachment 127148
Wondering if there are any tricks short of drilling and cutting the old housing to pieces. Thanks

Chris

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