Shimano 10 speed chainrings - teeth count different from 53 / 39 available?

[Bigbananabike]

I'm building up a 10 speed raceday bike but I want 50 / 42(flatter races) - are these available in 130BCD for 10 speed?
Where from ?

 

[Peter@vecchios]

I'm building up a 10 speed raceday bike but I want 50 / 42(flatter races) - are these available in 130BCD for 10 speed?
Where from ?

Sure, TA is a great choice.