The sets of blades included so you will have a spare set. You must have the original stainless steel support holder to make these work. See picture below.
You will receive two sets of rubber inserts. Each package contains two of the same length. These are all-new old stock GENUINE BOSCH and are getting very hard to find. The driver-side length is approximately 19 inches, and the passenger-side length is 17 and three-quarter inches.
1973 to 1980 W116 R107 Bosch Wiper Blade Refills for Original Silver Holders
$56.00
SKU:
BDP-116WIPERINSERTS 
Product Details
Here is a picture of a new rubber blade with the original flat stainless support holder. These are not available so you must use these from your original wipers.
This W116 has the original silver blade holders that are required for you to use these inserts.
If your W116 or R107 450 SL has the black replacement modern blades than these inserts will not work
