Some how I came up with this cover 57-3753 that has been chromed. has some minor pitting. make a fair offer.
one set (2 pistons) Apex rings for t100 +020 $35 shipped
one set KK "special superior quality" marked 750 standard 35
one set (minus one oil ring) Tri-cor CD
460 standard t120 make offer
two sets wrapped in oil paper, no marks seem to be the same size as the 750 standard rings make offer
one set AE hepolite r3870 +.020 650 $35
three oil rings seem to be 650 10 dollers for all three