What year did this version of Lakewood bellhousing make it to market?
 

What year did this style of Lakewood Oldsmobile/
Pontiac bell housing make it to market?

http://www.v8buick.com/index.php?thr.../#post-2797181

There are some guys with Lakewood catalogs from that era that will chime in. One thing you can use to date earlier Lakewood Scattershields is that they came with 4 digit codes stamped on the transmission side of the housing, later versions had (still have) 5 digit codes.