This always happens when you try to replace flexi pipes, the rigid pipes are siezed on. Soaking them with penetrating oil before you started might have helped! Any garage (or motor factor, sometimes) will make up pipes to fit. They need to know the length and end fittings, take the old ones in as a pattern. Have fun bleeding the rear calipers! Always tricky....pull the compensator round to the position it would be in if the car were heavily loaded and fix it there, this will allow a better fluid flow to the rear and ease the bleeding process.