E 13 SRS - differences between models??

Bit confused as to which model I need.
Its for a glory8.0, 83mm - BB shell. 1 ring
whatsthe difference between East coast, MTX, MTX wide etc!?
Also im thinking a 42ring - would this be best choice for DH racing, general freeriding with not much climbing??
cheers
Its for a glory8.0, 83mm - BB shell. 1 ring
whatsthe difference between East coast, MTX, MTX wide etc!?
Also im thinking a 42ring - would this be best choice for DH racing, general freeriding with not much climbing??
cheers
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Parktools :?:SheldonBrown
You should be fine with a std backplate MTX @ 38t.