You have a less expensive option.
Certainly AP175 will do the job for you, but by the time you add antennas, cables, and installation labor it's a lot to pay for two nodes.
Also, AP175 has two radios and there's no need to pay extra if you just want a single radio for bridging.
We sell a PtP bridging solution called the MST200 that runs our AirMesh operating system. The MST200s are self contained including a 14dBi antenna, and require no external hardware. Install is a snap, and AirMesh provides transparent IP connectivity for the ArubaOS APs on the other side.
Model is MST2HP-US. List price is $1,595. Your local Aruba rep can work with you to order. AP175 lists for $700 more before antennas.