In line. Will DM I think it is 1A27653. The black may be 1A27646. I think this is correct and fits 68-72.
1A27646 may be a substitute part number for 68 rather. It is 1384646 in 68 parts book. This one is listed with same part number and says came off a 68 Skylark, so I think it is same part. Just documenting here for future reference for people searching and trying to find more details. https://www.ebay.com/itm/203736670735