Martin Engineering QC1 Cleaner wit Spring Tensioner 

complete set with frame and Tensioner, the Part Number is 36898-XX-XX-XX-XX-X.
example following RFQ:

1. 36898-661160NBS    QC#1 HD Navy Blue Blade ASM Belt width 1600 w/ Spring Tensioner
2. 36898-361130NBS    QC#1 HD Navy Blue Blade ASM Belt width 800 w/ Spring Tensioner

QC #1 HD replacement blade with prefix Code 35381-XX-XX-XX-XX  
Heavy-Duty  Martin Twist Tensioner                                    38850   35381-XX-XX-XX-XX  
Heavy-Duty  Martin Spring Tensioner                                  38180   35381-XX-XX-XX-XX
Medium        N/A(Medium-duty Assembly is not available N/A      33496-XX-XX-XX 
Standard       N/A(Standard-duty Assembly is not available N/A      PV-XX-XX-XX-XX