Like many Subaru donors, my 2004 WRX had seen some winter weather. Therefore, most of the parts needed at minimum some cleaning up and a fresh coat of paint if I wanted them looking solid on the 818.
Also like many donors, mine had a fair share of miles on the chassis (150K). So I did some maintenance items like the wheel bearings just as a while-you’re-in-there thing. A harbor freight press is a godsend for this! With the press, the wheel bearings are quite easy.