Dave,
Something to consider... I have a English style (Made in India) solo seat on my Classic, it is great however I have had to make a small modification to it. In its standard form it tended to cut the circulation to a certain part of the male anatomy causing it to go numb. I have also experienced something similar when riding a bicycle.
What I have done to address this problem is to place a thin piece (~3/8") of high density foam under the cover. The jury is still out but so far so good...
Roger