Losi XXXCR front arms

[greyfox]

Have just bought two packs of LOSA 1112 front arms for my XXX CR and am intrigued by the dot markings on the X cross member in the centre of the arms. I thought it may be to mark them as 'handed' similar to the rear arms - the manual makes no reference to it. But it can't be as in one packet one arm has one dot and the other has two dots, however in the second packet each arm has three dots!
What, if anything, is the difference in the arms dependant on this dot marking on them?