Riding Mower Blades have different size bolts and holes?

Just picked up this mower, prev owner replaced blade bolt but the

Please VERIFY your blade size and center hole size BEFORE ordering *Blades NOT included* *High Lift Blades NOT Recommended* *NOT Recommended for 72″

X Blade Dual Pack (2 ½” wide blade - 5/8″ center hole - 2 pack 1 mower)

EGO 21-in Deck Extended Run Time Mower Blade for Walk-behind

1025R Mower lift arm - Snapped a bolt

High Quality Replacement Blades & Bolt For Honda Hru195 Hru196

Buy GOLD Hybrid Mower Blades: 21 Long, 2.5 Wide, 3/4 Center

RYOBI 20 in. Replacement Blade for 40V 20 in. Brushless Lawn Mower

X350, 48-in. Deck, X300 Select Series Lawn Tractor

Running Honda twin blades on other mowers

2 Blade Bolts 7/16 (with washers) for 174365, 532174365 Used on Craftsman Poulan Husqvarna Fits spindles with 4 mounting holes, does not fit spindles

Set of 2 Blade Bolts (Includes Washer) for Craftsman Poulan Husqvarna Blade Bolt Number 174365, 532174365

MTD Genuine Factory Parts Original Equipment 3-in-1 Blade for 21

Compatible with greenworks pro 60v and greenworks 80v 42-in crossoverz zero-turn lawn mowers and 42-in crossovert tractor riding lawn mowers, this 21-in mulching replacement mower blade is a genuine greenworks pro replacement lawn mower blade is designed for strength and flexibility, with the blade edge milled to ensure a smooth, even cut. Compatible mowers use two (2) blades. The length, lift and cutting edge are precisely designed to provide the best performance.

Greenworks 42-in Deck Mulching Mower Blade for Riding Mower/Tractors | 7509402

Spindle bearings for Craftsman tractor.