They look like standard corner modules to me, too. Recall that standard corners have 12 diodes, but are short enough to accommodate a 500-series halogen alley light. The extended corner modules came into existence simultaneously with MR-11 halogen alley lights.
Here's a photo of some CHP Liberty bars that may help:
Source: https://www.government-fleet.com/144637/chp-s-vehicle-assembly-line