So if you are wanting the CLXIII, why not go with the Pro? The wheelset will cost you $3,399.98 USD if bought without the bike. The C 38's are priced as a wheel set and will only cost $1,199.99. So there is a $2,199.99 USD difference in the cost of the two wheelsets alone.

Possibly I'm mistaken that the C 38's are sold a wheel set together. But there is no way to specify front or back wheel on the order page as there is for the CLXIII.