The original resonator in the rear exhaust pipe was a more rounded version of the one Simon sells. His is the normal standard now with the 2 halves of the pot joined in the middle. There are plenty of pattern ones that have a mini version of a normal silencer that are a tube with a seam along it and the end caps crimped on. Simon's type tend to more reliable. Back boxes always rust out first due to never getting really hot. This leaves a bit of condensation in the bottom of the pot and rusts them out. Some of these have a very small hole at the lowest point to allow the water to drain away. If not drill one after fitting. If you have a very fussy MOT man you can screw a short self tapper into it when you take it in.
Simon can make you up a kit of either Poly or rubber and you might get a small discount if you buy a complete set. He will run through with you what you need. Buy new nuts and bolts as well. As it's an advisory I would start by squirting penetration oil on all of the nuts and bolts involved. Do it as often as you can manage, say a couple of times a week until you take it in for the work. If it's not going in until next year, fine, just get extra cans! Plus Gas is good. Some bolts can be a real b*gg*r to get loose. And your garage, and your wallet, will get the benefit.
The clutch slave kit comes with the rubber cap you mention so you shouldn't need the fancy concertina one.
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