Bruce I think Autolite but I'll have to check in the morning. Is there any difference? I think they are Autolite because they are for the early version heads. Ford Racing are only for the newer heads I think.
HTO's are made my autolite. And they are only for 05-mid 08 heads. Ford racing makes thier 3vo plugs in both the 12mm and 16mm design.
No ones jumping on them as you can get them new from vendors for cheaper.