Stretch, grow or pull are out. That leaves a thick pad, spacers, wood extension or combination of all three. Start with a 1" thick solid pad and see how it looks to your eye. 1" is about the max. that you can get out of a pad without it looking excessively long. I have seen several at 1 1/2" and they look like crap to me. Solid horn is another option but that seems very European to me and often look out of place on a American klunker.