I ordered Biltbest parts from SWISCO and they just don't fit right - are yours different?

BiltBest Windows, founded in 1947, was a top of the line Wood Window Manufacturer - wiuth a full line of wood and aluminum clad wood windows and patio doors. Located in Ste. Genevieve Missouri, just south of St. Louis, formerly located at 175 S 10th St, Sainte Genevieve, MO, 63670 - BiltBest went out of business in 2010. 
You Can Now Get All Your OEM BILTBEST Window parts at:  http://www.biltbestwindowparts.com/catalog

Biltbest Operation and Maintenance Parts for BiltBest Wood Windows
Wood and Aluminum Metal-Clad Replacements and How To Videos
Special Function BiltBest Windows / Round-Tops / Awning Windows / Double-Hung Windows | Parts
BiltBest Window Replacement Screens
BiltBest Double-Hung Window Balances and Jambliner Replacements