Hi. This may be something you already know but to me it's new so I'll share the info. Girling G38 rear caliper N/S had stuck. With some gentle persuasion with a dead blow hammer I freed it off with closer examination it was the slider bolts. So I tried to get new ones for either side but for a Audi quattro coupe they are not listed. So instead of looking for the car I looked to see what else the G38 caliper was fitted to, the VAG group being who they are have the same application for alot of different models. So if you have the Girling rear Calipers and you need new guide bolts and slider pins then on eBay you can get a kit quite cheaply for either side that are listed for a VW Passat 1989-2000 also a MK2 Golf VW T5 Transporter all the same years. So don't let your local car parts man suck air through his teeth shaking his head thumbing through a parts catalogue saying " They're not going to be cheap!" Just look up on eBay if the cars got the Girling Caliper then they're the babies you need.??✌️. ?