KB, I have Deuce risers on My '99 IS supervalk, they came on it when I got it. Most everyone I know or have read about ordered the HD copies from J & P cycle, (who is having all kinds of sales these days). The $65 price is cheaper than any others available.
Take a look at this Tim Skelton link.
http://www.timskelton.com/valkyrie/how_to/risers.htmThis is what he says;
According to Mase: "These are from a HD Deuce. Part #56033-00 $149. They rise 5.5" and pullback 2.5". You will have to reroute the throttle cables to the inside of the fork tree. Also, you will need to cut the tab off the bottom (easy to do) and get different length bolts but that is it. It should only take about an hour and a few beers (finish the rest when yer done!)." The tab cut and throttle cable rerouting inside the triple tree are correct as far as I know. My seller had put on all braided stainless lines and they are longer, so I can't tell from looking at my bike. The longer bolts I'm not sure about. I believe you can use the bolts that come with the risers, but they are SAE not metric, and I believe it is necessary to drill out the riser bolt holes in the tree, but only a few thousands of an inch for the bolts to fit through. I cannot tell you the specifics, but have read this is a very simple deal to do once you know the correct size bit to use....it just relieves a very small bit of metal from the holes, and even if you want to go back to a metric riser/bolt setup, it will be fine.
Another option would be to look at the SCOOTWORKS catalog, on-line for their fat risers.
http://www.shopscootworks.com/shop/productdetail.htm?browse=-19162&productId=-130392&shopBy=-3096&catalogId=-799The problem with shopping risers is some give total length, rise, pullback, and others only give a distance higher and back than stock (stock are something like 3 1/8 inches tall). But I do not know if the Scootworks risers are drop in (probably), without drilling, but the II's are aslo listed to require rerouting the throttle cables.
Now I put the Aeromach/Lamonster (identical but different makers and prices) risers on my first interstate, and they are fancy and expensive, but totally covered by the fairing, and they are the tallest and most pullback you can get without any rerouting or lengthening of cables, and they bolt right up with no drilling. Only thing you have to do is turn the wire clips on the back of the handlebars around 180* to give the wires/cables a bit more room. Interestingly, Aeromach and HDL give a bit different information on total rise and pullback for these identical risers
http://www.hondadirectlineusa.com/stores/product.asp?pid=519&str=2&ID=430131648http://www.aeromachmfg.com/product_p/am-4120c.htmI am 5'9" with a 33" shirtsleeve, and I liked the Aeromach's fine, but I still wished for a bit taller riser, but with no more pullback. I was pleased to get the second bike with deuce, and they are like 5.5" tall, but because of the wide valk bars, I sometimes get a little pain in my right throttle wrist on longer rides, and when I am sitting up paying attention in rain or traffic (because of a bit of an angle in wrist to bar fit), as opposed to sitting back in the backrest with my feet up on the HWY pegs. And turning the bars to full lock, the deuce put your hand close to your thigh (not touching but close). There is always a little play up and down in the bars regardless of which risers you use, but this is more limited in the IS because of the fairing. Overall, I have decided I like the Lamonster/Aeromach a little better than the deuce because my wrist never gets sore with them.
Finally, for a no frills 4 1/4" riser (a 1/4" taller than most of the 4" risers available), HDL's own house brand Cyclehouse will also bolt right up with no mods, and are also cheap.
http://www.hondadirectlineusa.com/stores/product.asp?pid=468&str=2&ID=430131648I hope this is some help.
Edit....I did not see the cheaper deuces when I first read your post. Those are likely made by the same people J & P uses (who is always high) .......but risers must be bulletproof.