Not quite. These are the original (single bolster, I think) bogies so are correct for early green units. Phase two units {non powered} had commonwealth trailers from new. The original trailer bogies on phase 1 units were rebuilt with an additional damper, blue in the centre (mk4) , I think from the late ‘60s to improve the ride. Hence phase 1 B+G had mk4. And phase 2 commonwealth. It’s a bit simpler on refurbished units, which all had commonwealth-except a small batch that initially ran on mk4s!