Curries version of the joint or a copy?
They will loosen up over time and need to be shimmed to be tight. You have to use a press to put them together properly ( and take them apart if they are tight ).
The bushings are not avaliable from anyone but Currie ( and distributors ) last I checked ( been a few years )
Be careful making your own 'adjustable' version with stems welded on. The forged one-piece units are better.
The grease used to lubricate them needs to be polyurethane compatible.
They are a little stiffer 'feeling' than the stock rubber bushings. If you have a slight rear driveline vibration you will notice it more.