My first session of winter bashing is the snow (AWESOME!!) resulted in a broken steering turnbuckle. Fortunately it was on my last pack..Wohoo! My questions is what size do I need for a direct fit?

The Traxxas parts list shows 3...49mm (#3643), 58mm (#5539) an additional part (#3644) which is 39mm. Do I need that last one? What is that one for?

Would it be better to go aftermarket and if so, recommendations?

Yea, I know, pics or it didn't happen... Here!