get the heritage chrome grab rim PN52687-97 and backrest pn52827-97. I have an o5 deluxe and it bolted right on. this is the rest from the heritage softail. somewhat lowwer than i like but will do nicely.
Charlie- look at my past post- I have a 05 Deluxe and if your a bit adnenturous the a Heritage dual rider bar and Heritage low backrest fits right on-a 5 min job.I like it on mine and beats 4-600$ for a new seat that not as comfortable as the original. Just my opinion- I listed the required part numbers-cost for both is about $250.
Lovetiride- if you have a HD 2005 accessories catalog-botttom of page #276 middlr of page - item D-part number 52827--97 for $115 plus u will need the Heritage rider bar part number 52687-97 for $148(tall pad with rider rail)
I realize there haven't been any posts here in a while, but just wanted to say THANK YOU to phoenix for the info... I've been trying to find a rider backrest for my Deluxe since I bought it (Jun '06). Only options I could find were to give up my stock seat which was absolutely NOT an option for me. Finally came across this thread doing an internet search and as soon as I read your post, I ordered the parts. They came in yesterday and just like you said, they fit perfect, look great,and took almost no time to install - did it right in the dealer parking lot with just a few basic tools. Am definitely riding comfy, now!! Already received tons of compliments.