tdsteven,
I do not recall Mahindra ever offering a single spool hydraulic remote kit for the E350.  I have asked parts at MUSA Houston to confirm.  The E350 has less hydraulic volume output than the 3505.  A 3505 kit would possibly work, but i have never seen it done.  The one E350 that I am aware of that had a loader installed did not give stellar performance.  Just my $.02
Scott @ Artec