They slide in bores in the calipers.
They have rubber boots on each end to keep water and crud out, and lube in.
You might need to spray some Liquid Wrench or PB Blaster into the bore, to free them up enough to remove them.
You might be able to get the boots off with the sliders frozen, but they are kind of a snug fit. They could tear. Also, the solvents in the PB Blaster might attack the boots. Be ready for that. I *know* that a liberal application of brake cleaner will make them swell up.
I think the Fiero Store sells slider and boot kits, but they're kind of spendy. Around $35 per wheel. They may be available elsewhere for less. (I had a parts car. I was fortunate in that regard.)
Check this page Third item on the right.
[This message has been edited by Raydar (edited 02-05-2004).]