The 158.18023 I own is a super-high shank. The machine came with the tower of attachments (a plastic set of stacking boxes with compartments for the feet/cams/other bits). These appear for sale on eBay but make sure you're buying them for the correct shank height. I'm not sure if all 1802 series machines (there are four) are super-high but I believe most if not all are. This is another of Kenmore's machines that has a built-in buttonhole drive underneath the slide plate. These machines make terrific buttonholes and overall, the 1802 series are outstanding machines -- some of Kenmore's best.
So, in order to recommend the correct attachments, we need the full model number. What is the digit after the '2'? (And the 'C' cams are available on eBay all the time for very little. They appear on craigslist all the time, too. If your machine is a super-high shank, the feet will cost, as they're Kenmore proprietary and not applicable to any other brand and I don't believe there are generics.)