They are what they are: MacBook Pro fan replacements. Unfortunately, the screw connection for the left fan was loose and caused a very audible noise.
Glarks 660 Pieces Phillips Assortment Motherboard
10 Review
π§ Premium Repair Replacement Screws & Tools for MacBook Pro Retina 15"/13" - Complete Bottom Case Set
10 Review
MacBook Retina 13-inch (A1425, A1502) and π© 15-inch (A1398) Bottom Case Screw Set with Pentalobe Screwdriver
11 Review
M.2 Screw Kit: Easy Mounting for NVMe SSDs on ASUS Motherboards
19 Review