I found all 4 parts for, some may spawn in different areas but below here are the locations that I found them in.

1st part - Red flag is found in same room as Stamin-Up, next to it or the mystery box.
http://imgur.com/wtzxZWW

2nd part- Bellow is near Speed Cola, it should be on your right when you buy the door.
http://imgur.com/zWkNFQO

3rd part- Chicken wire or net is on the same floor as Banana perk, but opposite, can't be missed easily.
http://imgur.com/dAx1AI7

4th part - Motor is found when you go underground, it spawns next to the radio above the yellow light, again can't be missed easily.
http://imgur.com/CVnXHPr

If any of this doesn't make sense, I will edit it once i'm awake. i'm tired but here you go, sleep time for me! enjoy the game:)