m20 eta piston part numbers !!!!! help now

[e30m20TurbO7]

so i needto buy piston rings and i dont know what year the pistons were in production
11251713178 the part number with trough to 11/1986



11251713192part number from 12/86

which pistons do i have

it doesnt have the tangs on the skirts like some eta pistons,
these late model eta pistons?

[Bimmer_man]

take the pistons to a auto machine shop and have them check it thats the best way of knowing that way you get the correct numbers.