I just checked my awning channel spacing for the OVS 270 LT and it’s (roughly) 4.125” / 105mm inside to inside, or 4.375” / 111mm center to center.
The bracket adapter you linked states “max 100mm spacing” but curiously, in the compatibility chart, OVS is listed in every section.
The XD is recommended for channel spacing of 100-120mm so that may be my only option.
I may just call the US store tomorrow. It would be much easier if they posted the bracket dimensions!