yep i used 2 so have 2 spare
on the lower part if you have the holes (bolts corroded through) slide 1 end through each hole and around the downpipes - the ties work like the plastic ones - pull harder to tighten
i took my car to an exhaust fitters to get them to remove the heatshield bolts and was told they'd have to take off the manifold, drill out the bolts and rethread - would have been upto 4 hours labour at £40 p/h - cable ties were a bit cheaper at £2.49 and 5 mins for me to fit