Nathan, the dating I can see on the packaging in your ad indicates copyright 2000. Here is what I think is an earlier Sealed Power AT-274 that looks more like a normal lifter we are used to seeing. Can't say that I have seen the lifter design your ad shows before, but it has been a long time since I purchased any. wink

~ Dan
1951 Chevy 3 window 3100
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"My Grandpa Carl's Truck and How it Became Mine"
1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver)
US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)