I'm pretty sure they do mate, the only difference I have noticed is that the first gen 155z had a standard kickstart shaft where now the 2nd gen 155 and 160 have the wider 16mm shaft with stronger kickstart gears, and the 2nd gen has the separate clutch case and oil filter where the first gen had an oil slinger where the filter now is. But I'm sure the the 160ho is a glorified 155z badged a 160