These keys will fit the Roland FP8, HP730/2800/3800/5700/7700 some RD500s and possibly others. They are somewhat yellowed and we can not guarantee an exact color match with your existing keys.  If you're buying for the RD500 be sure to look at the photo as there were two different styles of  white keys for this keyboard. The black keys are all the same. These keys also fit the following keyboards. 

Roland FP-8 
Roland HP-730
Roland HP-2800 
Roland HP-3800 
Roland HP-5700 
Roland HP-7700 
Roland RD-500 (type 1)