Hi Razor61
I was doing some digging and came across what i believe might be the bushes that you were referring to? Does this look correct to you?
https://www.ebay.co.uk/itm/2-x-Lexus-LS400-Front-Lower-Arm-New-Poly-Polyurethane-PSB-Bushing-Kit-1990-2000/183479746676?hash=item2ab83ec074:g:bcMAAOSwvYZbvgNd
Thanks,
Jack