There are two types of assembled clock springs available on eBay. Generally they are labelled with an "L" for left hand drive vehicles and these are cheaper, and with an "R" for right hand drive vehicles and these cost a fair bit more.
I've used both. The "L" ones will change the indicator cancel behaviour when cornering in a right hand drive car (I presume it works the same the other way too).
Either one will restore electrical function to the steering wheel controls.
My best success though was when my wife found a source for the ribbon cables that go into the clock spring. I disassembled the device, replaced the cable, reassembled it and ensured I had it centred properly before reinstallation (also made sure the car's wheels were pointed straight forward).
This same spring is still in the car after several years, and hasn't missed a beat.