Back to your other thread on the same question?
There are 3 options:
New OEM = most expensive 275 amp controller not suitable for modified carts
rebuilt OEM = same but up to 300 amps, still not suitable for anything more than golf course use. High failure rate with some rebuilders
Aftermarket 400 amp DCX Alltrax and HD solenoid = suitable for modified carts on 36-48v. 30% more torque and speeds up to 24mph.
That's what I would use.