Picked up a new Stevens 200 in 243 win. just before xmas. Can someone tell Me if these are the part numbers / product# from Midway that I need to order to convert it to 223 win.

I already have the the 223 barrel that I picked up from someone locally. And I have the other stuff to switch the barrel's already.
Should I just buy the whole bolt assembly or , can I just buy the bolt 223 bolt head and proper blind magazine ?

Midway Product # 548296 - 223 Bolt Head
# 722986 - 223 Bolt
# 472997 - 223 Magazine Box

Thanks.