Terrier Jim, Some of the part numbers you listed are for the R200.  They are: FJ451 X7828 X7831 The D7896 doesn't look to be compatible.  Let me know if this helps.
Hi I have some rail kits and wondering if any of them will fit an R200? The part numbers are: 0X7831 0D7896 0X7828 0FJ451 I can't find a reliable answer anywhere. Can anyone advise please? Cheers
Rails for R200