they should fit most cars from the last 5 years or so... straight plug in replacement. (you can check if your current sidelight bulbs just push fit, rather than screw or bayonet, if they do they should fit)
i shouldn't really plug my own business, but I sell them (import the LEDs in from malaysia).
a lot of the ebay ones I see blow within 5 mins of use, these seem rock solid, follow my link in siggy for specs on them.. again sorry for plug, but it's a useful link as most LEDs I've seen are just junk.
It's a 2001 pre facelift focus. The sidelights just push into the reflector. Do bikes run at 12v?