SRAM X9 Front Derailleur 2x10 speed Compatibility and specifications

SRAM X9 Front Derailleur 2x10 speed for 10 speed MTB, 2011 model series.

Sram X9 front derailleurs comes in 10 references (!!) for 2x10 speed specific, and there are also 8 models for 3x10 setting, geez, that is getting very specific just to shift a couple of gears only.

The X9 front derailleur 2x 10 models are:
2X10 HI CLAMP DUALPULL φ31.8 - Ref# 19011050
2X10 HI CLAMP DUALPULL φ34.9 - Ref# 19011051
2X10 HI CLAMP DUALPULL φ38.2 - Ref# 19011052
2X10 LO CLAMP TOP PULL φ31.8/34.9 - Ref#19011053
2X10 LO CLAMP BOTTOM PULL φ31.8/34.9 - Ref# 19011054
2X10 HI DIRECT MOUNT DUALPULL - Ref# 19011055
2X10 LO DIRECT MOUNT S1 39T TOP PULL - Ref# 19011056
2X10 LO DIRECT MOUNT S1 42T TOP PULL - Ref# 19011057
2X10 LO DIRECT MOUNT S3 39T TOP PULL - Ref# 19011058
2X10 LO DIRECT MOUNT S3 42T TOP PULL - Ref# 19011059
Wide range 2X10 with X-Glide front shifting technology
High Clamp, Low Clamp, High Direct Mount, Low Direct Mount
Speeds: 2X10
Material: Steel
Outer Cage: Steel
Inner Cage: Steel
Finish: Black
Technology: Wide range 2X10 system with X-Glide front shifting technology.
If you mount a 2x10 Sram front derailleur, you should be using a Double specific left shifter.

Compatible with Sram 10 speed shifters, XX, X0, X7, SL-700, Double-Tap flat bar, R2C Aero, 900 TT, 500 TT, Red Double Tap controls, Force Double Tap controls, Rival Double Tap Controls, Apex Double Tap Controls.