Hello, Fred.
Here is a video of the SRB-5 bushings. They say these are for racing and the SRB-4 is for street cars. I think that the SRB-4 bushings are made with softer rubber.
See: https://www.youtube.com/watch?v=cShlNItp5Qc
The dimensions of these are different (longer) than stock and you may have to re-adjust your alignment after you replace the stock bushings with the SRB-4 bushings.
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