Once a pad's length gets beyond an inch, the aesthetics of the gun go south quickly. If it was my gun, and I needed to add 1.5" to the LOP, I would add a 1" pad and then slip on a temporary leather pad to get the other 0.5". Cheap slips-on pads be had for $30 and nicer leather pads are less than $100.
I concur with Ken, be wary of the extra 1/4 in thickness and aesthetic effect. Be sure you really need that 1/4 inch, with hunting coats etc some guns end up too long too fast. That said also more important than the look, is the effect on balance. Thick heavy rubber pads can really change a guns performance, which is why I am a big fan of the lighter cervallati microcell pads, half the weight or so of the same thickness Silver or Kickeze pad. They will move that center of balance less than otherwise, and not raise overall weight as much.
