I'm very happy to hear that you received your package at last
Yes it is direct swap, I do not recommend you to use bearing and bush which come with vrossi package, as it's inferior in quality. Instead, you can re-use your existing OEM bearing and bush if it's still in good condition. i'm afraid 160/70 has no clearance with swing arm. recommended size is 160/60/17 or 150/60/17 for rear. as for front, you can either use 120/70/17 or 120/60/17, and I don't see any problem if you intend to replace only rear rim and keep front rim as it is, only spoke design will look different, if you don't mind about it