Time has finally come to post info about upgrading rear suspension bushes. I've put together a pictorial reference so that it's hopefully easier to understand what you need and what you need to do. In this case you won't have to do that much. The main thing you need to know is that the part numbers listed in the drawings are Red Ranger part numbers, which are listed on the following website:
www.nolathane.com.au. If you're interested to find out what vehicles those bushes actually belong to just input the part numbers into the search bar.
You'll only need to buy one kit for the entire upper trailing arm bush assembly as pn#46060 comes with 8 bushes. This should cost about $93.82 retail from Supercheap Auto. You'll also need to use the pins that come with the kits. The areas written in red are the small mods you’ll need to get the job done.
The lower trailing arm requires two bush kits as given in the drawing below. Part# 46189 should cost about $73.95, and part# 46193 should cost about $147.55 retail. Part#46193 will also have 8 bushes and 4 pins in the kit, but you'll only need half the kit. The other half you can sell to another Piazza owner or whatever:
Some might be already aware that the front part of this arm has, in essence, a bush inside a bush. Combined with it's centre pin this configuration is no doubt designed to reduce NVH levels. I've drawn an enlargement of the inner metal bush/sleeve (with real pics below) which is encapsulated in rubber between the main arm tube. However, due to it's uncommon internal diameter size and the stepped surface finish of the inner sleeve I was unable to find a suitable bush replacement to go inside the inner sleeve. Solution? Knock the inner sleeve and associated rubber out, thereby leaving a clean main tube and an internal diameter that I can work with. Now some may argue that this will sacrifice NVH levels, and since I haven't driven the car yet I can't test this argument. Perhaps bugle can step in and shed some light on this as he has done something similar I think. But I personally think it won't pose much of a problem because there is so much nolathane material in its place now, and I also believe cornering will be flatter and sharper.
For those who want to retain the inner sleeve then I suggest getting some custom bushes made/machined using the dimensions I have provided, and a recommended maximum tolerance of +0.2mm for the outer diameter bush size.
Below is what the front bush assembly looks like on the lower trailing arm. Note the centre pin actually looks more like a "+" with the rubber bush moulded around the pin to be as one piece. As the pic shows, the original rubber bush is inevitably damaged when you try to remove the pin . You can also see the stepped surface of the inner sleeve.
