Quote:

98827-16 Elite Race™ .180" Offset Roller Lifters .904" 4 Pairs Centered & Left
4 Pairs Centered & Right (4) 98829CL-2
(4) 98829CR-2

From the Comp Cams web site:

web page
Interchangeable pushrods seats can be easily swapped for centered, left or right offsets. A patent-pending design allowing oil control through the pushrod insert allows builders to modify lifters to meter extra oil to the top.