Thank you for contacting the AnswerARMY.
There are two different brands of engines used on the DRT900 series of tiller.
Briggs and Stratton and LCT.
If the engine is a Briggs and Stratton you will need to contact an authorized Briggs and Stratton dealer to purchase those parts. This may or may not be the same as your authorized Husqvarna service center.
If the engine is LCT those parts can be ordered from either your local authorized Husqvarna service center or a local authorized LCT service dealer.
http://www.briggsandstratton.com
http://www.lctusa.com
Thank you for contacting the AnswerARMY.
There are two different brands of engines used on the DRT900 series of tiller.
Briggs and Stratton and LCT.
If the engine is a Briggs and Stratton you will need to contact an authorized Briggs and Stratton dealer to purchase those parts. This may or may not be the same as your authorized Husqvarna service center.
If the engine is LCT those parts can be ordered from either your local authorized Husqvarna service center or a local authorized LCT service dealer.
http://www.briggsandstratton.com
http://www.husqvarna.com
http://www.lctusa.com