The tension pin can't be replaced, it locates in one of the 3 little holes on the frame or forks to set tension, it has been missing for years and tension is easily set by holding the brake in the required position and tightening the 5mm holding bolt.
It doesn't affect opperation and can't be seen when fitted.
The levers aren't available, sorry.
Final price is £25 which includes UK postage.
Hope that explains it.
Drop me a PM if you'd like them.
G