I did a little research on the square tube seat riser modification and came up with
[email protected] who makes the risers. He gave me this information and gave his permission to share:
I have them in 1in are $42.50 1.5in are $45.00 and 2in are $47.50 usd shipping, hardware and instructions included.
I ordered one set of the 1.5 inch. He just did a PayPal request and now I'm waiting to get delivery. The price above is per seat. My wife, vertically challenged, didn't want one so I just ordered one for the driver side.