Which size gator on steering rack

[Jess&Chloe]

06 1.2 16v Clio campus sport
One of my steering rack boots has split, euros has 2 options
1.
Inner Diameter 1 [mm]12
Inner Diameter 2 [mm]42
Length [mm]143
Other InformationManufacturer Restriction- TRW, With PAS
2.
Inner Diameter 1 [mm]9
Inner Diameter 2 [mm]39
Length [mm]168
Other InformationManufacturer Restriction- SMI, With PAS
How do I know which one is right and what does TRW and SMI stand for?