34 50 16t difference, is popular .. sugino still makes the punch cut chainrings,
but a lot of others, now, offer a 110 BCD chainring in 7075-T6, a harder alloy which is machined..
and adds shifting pins to the inside face of the big ring.. helping the up-shift..
QBP , thru bike shops, offers a stainless steel , good for the 110-34t ..extra long wearing,
and also the outers as suggested above for the 110-50t..