This is a genuine OEM replacement part, it is sold individually.
The purpose of this filter is to help eliminate dirt, dust and debris from contaminating the carburetor and damaging the engine.
A dirty air filter can cause the engine from operating properly.
This filter can be cleaned a time or two by using an air supply. But it is advised to replace it once it becomes dirty.

This is an OEM replacement part sourced directly from the manufacturer. Sold individually. This no grease mandrel assembly includes housing, shaft assembly, bearing, and nut only - pulley/washer and blade bolt/washers are not included.

This is the part the mower blade attaches to, it is mounted to the deck of the mower by four bolts.

Spacer must be installed under the pulley.
Installing with the spacer on top of the pulley (or failing to use spacer) will result in damage to shaft and pulley.

The mounting holes on the Mandrel are not threaded. But the bolts that are used to secure the mandrel to the deck are self tapping. The Mandrel shaft goes thru the deck and the pulleys are attached to them, then the belt that drives the mandrels is placed in the pulleys.
Size: Tall

A genuine Husqvarna replacement part, sold individually. Bolt is 3/8-16 X 3-5/8. It is commonly used in riding mowers to keep the gauge wheel in place. It is compatible with the riding mowers listed below. Wrench needed for install.

Genuine Husqvarna replacement part, this item is sold individually.
This is a self threading screw that is most commonly used for securing the mandrel housing to the mower deck of the riding mowers listed below.

This is an OEM part sourced directly from the manufacturer. This part made of metal and is sold individually. It is commonly used in riding mowers to secure the wheel in place. It is compatible with the riding mowers listed below.

This is an OEM replacement part and is sold individually.
Its propose is to deliver an electric current from an ignition system to the combustion chamber of a gas fueled engine.
It will ignite the air fuel mixture by the spark.
Spark Plugs will usually have to gapped to the manufactures specifications found in the owners manual.

Over time a Spark Plug will become fouled because the air/fuel ratio may be set wrong,worn piston rings, carbon build up and other factors.
It is better to replace a fouled spark plug, rather then trying to clean it.