We need to buy the plastic keyed couplers for the Denso-nippon window motors. Where can we find replacements? We checked IFI and FIRST but no luck! 
Thanks for the help in advance!
Depends on what you want to do with it. We found that a 1/2" iron pipe split hanger clamp fits perfectly. It is ideal for attaching a concentric shaft.
We are turning a keyed shaft with a sprocket. Please explain this 1/2" iron split hanger clamp and possibly where to find and buy.
Thanks:)
Pipe hanger available at Lowes for $1.58
http://www.lowes.com/lowes/lkn?action=productDetail&productId=82172-1816-L26322&lpage=none
Unable to upload picture.
Sioux Chief Model: L26322
1/2" Split Pipe Ring - Galvanized
Lowes Item #: 82172