Inner tube valve stem?

Hi! Which brand of inner tube has the tightest bend on the valve stem? I have a Scootrs disc on the front and the brass 90 degree valve stem hits the caliper on two of the three inner tubes. One of the ones that touches is a SIP one, 81074000. So I need one that has a tighter radius or is a little shorter before the bend. Hope that makes sense!

I have standard split rims and 3.50-10 tyres.