I believe the 126 would not be a problem. But please be aware that all the high current alternators have studs for connecting the output and field wires, not a simple littel plug like some alternators use.
You have to replace the output wiring too if you are going to be able to safely perate a bigger alternator, what's the sense of burning up the wiring? I found some 8 gA teflon wire that will handle 115 A peak if two are paralleled. Where you attach the load(s) is also important, so an additional bus or fuse block for aux. blowers is highly recommended, the existing terminal assy is a bit overloaded if you ask me.

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'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body. '87 300D w/ Sportline suspension. No more '79 300TD w/ 617.952 engine at 367,750, it was my annual driver to Texas and I sure don't miss it poor A/C heater system!