With the engine the kit has, it really should be a 127". When this kit was developed, the 127" long hood wasn't a style option, you got it if you spec'd certain engines. It was around '82 or so that the long hood (no such name as 'extended hood' in the Peterbilt price book) became a style option as well as a requirement with certain engines. Standard config with this engine and the 8v92 and 8v71 turbocharged would have the air cleaner on the left (single only as there wasn't enough room under the hood for the piping to the right for a 2nd air cleaner). The RH Luberfiner is correct. If a 2nd breather was installed (perhaps a dummy unit on a 119") the Luberfiner would be mounted on the frame rail beside the battery box (left or right).
Take a look at the red 359 on the left and the orange 359 on the right.
Tim