FC in need of outer sills

[KenD]

Total long shot, but does anyone have any outer sills for a FC in good (ie non corroded) condition - or come to that a structurally sound FC shell they can be cut out from?  Mine are an advisory on the last MOT but I can see they are probably going to need replacing before too long. No longer available from Mazda so its either a case of fabrication or find some non rusty used ones.  Have a family member in the US trying to source them, but clearly if there are any available here that have somehow avoided rusting out it should save on costs!