finding the Rotax engine manufacture date and model

Hi.

I would like to know more about engine with s/n 4404413

This is all the available information.

Model: ROTAX 912 UL

Production Date: 10.04.2001

Good day 

Please advise the year of M/F for 912 ULS  SN: 6785181 

Regards

6785181 was produced 02-Nov-2015

Engine Type 912 ULS2-01

Model ROTAX 912 ULS

Description

• without fuel lines
• UL2 I=2,43 with clutch
• without vacuum pump
• with green valve covers
• without mech. tachom. pick up
• without external generator
• without air guide baffle
• with std. temperatur sensors
• with nipple conn. for oil pump
• with expansion tank
• without air box
• bent sockets for engine truss
• starter large

I would like to know production date for 912 ULS Ser # 5645048