Precisely how many balusters are needed for the 91.5-inch and 67.5-inch sections of this railing? Total per section as well as balusters-per-foot?

Hello Vinny, and thank you for reaching out to us! For this, it appears you are looking our Trex Transcend horizontal railing with square composite balusters. A six foot section (67.5") would typically require 13 balusters and an eight foot section (91.5") would typically require 18 balusters. For more specified measurements of how many balusters may be needed, please call us at 1-800-289-8739 as we would be more than happy to discuss this with you! Thanks - Paul, Trex Customer Care