If you need replacement screws for the bottom panel – the original ones are quite soft – I used
- Sheet Metal Screw #4 x 3/8″ (Type A)
You can find this at Home Depot. The head doesn’t really matter.
Top – original screw, Bottom – one from Home Depot.
Some modders will try to sell you a flat-ended screw (“Type B”) at a rip-off level prices – don’t buy that. You don’t need self-tapping or self-drilling screws either (has drill-bit end). You already have the hole.