Try this guy at meancitycycles.com , He charges $40 bucks to mod your seat and he is a pro. For a little more $ he can put in memory foam. Whole lot cheaper than a new seat
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Did mine myself and made a mess. I didn't have the corect type of stapler and didn't get the foam very smooth. I ended up sending it to Allen at Mean City Cycles to get it cleaned up. He will modify a Streetglide seat for $40 plus shipping. Not sure about the cost for other seats. He is listed in the Vendor section of this forum.
I just got the seat from my 07 RKC seatback from Allen at Mean City and it looks like a first class job. Haven't had a chance to try it out due to weather but it sure looks like a professional job. He even took the trouble to call me and tell me he couldn't trim the nose as much as I wanted so that I wouldn't be surprised. About one week turn-around. If it feels anywhere nearas good as it looks I will be thrilled. Very satisfied with the quality of the redo-highly recommended.