The B66VL is the long-stem version of the B66V and replaced the non-valve B56.
The retaining clevis pin entered through the valve sleeve. Below the clevis pin is the 2" black plastic screw-down cap retaining the valve sleeve.
The B66VL used a low-speed fairing block #33-029 that is no longer available. Other replacement parts are the same as the older-version B744VL.