Mr2 aw11 1987: Rear roll bar diameter?

Hello,
Im looking at the Prothane bush kit 18-2008-BL. Its a USA made kit and both the front and rear anti roll bar diameters are listed as Ø18mm (probably 3/4"). Has anyone used it and got an opinion of softness Vrs the local superpro equivalent? Is the Aussie delivered Mr2 rear bar this big? I thought it was closer to Ø13mm. I can get it on stands and measure it up this weekend, but if anyone has travelled this path before id appreciate the news. I was going with the superpro kit until I realised it didn't include the bush for the inner rear steering link. If anyone has measured it up and knows a superpro bush code to fit that location, id be very happy to know that as well.
 
While Im on topic, Moog have a ball joint set for the AW11 which on some forums was identified as rebranded Senkei which was the MR2 OEM supplier. Has anyone used them with good results or is it still best to just buy OEM?  
 
Regards,
SteveB