Hi,
Yes unfortunately the original post was not clear at all. There are a number of possible interpretations...
1. Change from going from S to P to going from P to S, or vice versa.
2. Change the direction of the serial data from going left to right to going right to left.
3. #2 hard wired (pin arrangement) or #2 software (able to change direction multiple times on the fly).
There are chips that can do these things but i havent checked pricing, and of course #2 hardwired just means changing the pin ordering to go backwards.
I also mentioned staying with the original logic family assuming that the rest of the circuit has the same (HC) type devices. It is often not a good idea to go from one family to another unless you've researched the ramifications. Going from a slower family to a faster family for example (F) could cause the faster device to pick up multiple clocks from a single family clock pulse, as well as possible logic voltage level incompatibilities.