Correct, Dseries rods are thin as ****... lemme see if I can find that picture...
Dseries left, Eagle right.
Dunno what rods you can go with in the D15s... I know the eagles will push the piston too high and whack the cylinder head.
FYI, I pushed 217whp on a stock D16Y8, you really don't need to do much engine work to push that much power out of these engines.