...are a direct fit and bolt on with no hassle. Got these for $40 along with a few metal sleeves that came with the Progressive Suspension box they came in. I pushed in the appropriate sleeves and they went on like they were OEM. Looks miles better than the Mike's piggyback units which looked out of place with the garish yellow springs. Some may think the no coils look of these shocks are out of place on an XS, but I like them. I can alreay feel a massive improvement in suspension response. No surprise, since the Ace is not far off in terms of mass. Eye to eye is perfect.