this summer i recently added some clamp on rod holders to my '02 282 pipeworks (should be very similar in size if not the same pipe diameter).
i went with Taco aluminum clamp-ons bought from Cabelas. They are the largest diameter model which i installed on the "fat" mid horizontal span tube. Looks fantastic as it matches the existing pipework perfectly.
alum. models are a bit more $ than SS but perfectly matches the alum pipeworks.
if i recall, the price for these at cabelas was pretty darn competitive.
also if memory serves me correctly, Taco's did NOT come with hex/allen keys (2) needed for installation (so make sure you have some so when you get them, you can install asap and admire your work without delay)