If you are in need of replacement door sills for your Cadill-Ike, you can purchase them directly from the maker and save some money ($260 vs $350 from a vendor).  Donald Kuehn is his name.  I just received my set from him and they are perfect.  No credit cards or paypal, only checks.  You can expect to wait up to 6 months to get them but you may get lucky like I did because he had a previous order in the works for someone else.  So while he had the tooling out he made my set and I had them in 5 weeks.  Here's the contact info —
 
Door Sills
Donald Kuehn
81 Graham Avenue
North Haledon, NJ 07508
973-423-1196 973-904-0433
Doorsills (1922-60) -- custom handmade