L-23 inner tube

I need to buy a new inner tube for the club's L-23.  I was hoping to do
that
this week, but I forgot to check the valve style before leaving the field
last weekend.

Can someone tell me if it is straight or right-angle type?

Also, are people routinely substituting the 5.00x5 size for the original
350x135 size tire with no problems?

Thanks,
Bruce