update? seems up to date to me - and I don't have any more contact with them than using their electricity to BS with folks here cuz of their generosity

maybe your problem is getting to the right list - just click "view/order parts" on the left of any page, then click the proceed button, then select your year and proceed again to the whole list
this wheel? - it's where it belongs, in the 57, 58, 59 lists [it's the same for those 3 years], under
Steering Column Items, down at "Steering Wheels and Horn Button Caps"
there's an awful lot of parts to onea these trucks, just have to scroll the lists and think about how they might be cataloged - one of the reasons I use their online catalog as reference is they've got it well laid out and most things have accurate pictures rather than "artists conceptions" - their prices are comparable to most vendors, cheaper than some
Bill