the part number seems to be superseded by #11251338417 s. they are/can be used for r65 86-88.. and 1977-1980 r80.. i would say they are for the iron sleeved r80/7 denoted by the S. my parts shop has them for 119$ with the old stock number. they also seem to be the not HC pistons from parts fisch
the other set. #11251258063 suprseded by# 11251258064. they are r75/5 pistons 8/69-7/80 ECE. i believe these are HC and listed at N/A but they have some for 189$