Bearing question

Picture shows two of the lower bearing not fully grooved.....
Rear main fully grooved...Thrust bearing full grooved....

From Application page.....A-Series aluminum bearings 3.530" max. flange OD.... Pos. 1 bearing full grooved
Pos 1 bearing fulling grooved...

I know 318/340 have same main bearing size...but looking at Summit ...they only list it for a 318......dont know why

fitting 1979 to 2003 5.2L engine