Much, much cheaper than Lowes, Ace or Home Depot. If you can't name or properly identify the fastener you can E-mail pictures or worst case send them one as a sample and say "I need more of these" or "I want this but in stainless".
If replacing much of the hardware you'll have to decide if you want to stay with Torx 25 head hardware which is the most common used on the Gator or switch to something more commonly available like a Allen or Phillips head.
XUV 550, engine replaced with Honda GX630, MBDiagman tuned primary clutch, all LED lighting, roof mounted Rigid LED lights, split no scratch wind screen, roof, home made rear panel & window and 1/2 doors, Super Winch 4500, set of CST Ancla tires & set of Carlisle All Trail tires