As far as I know there are three PRs: Mulfab, SSL and SiFab, all a little different. Mulfab and SSL can be checked out on the net, but I cannot find any info on the Sifab. Mine is SSL, though - worked fine in both fitting and when driving. And excuse the thread drift.....
But I'm the only one who gives out information on here frequently.... (awaits Peter Ballard to pop up....)
The Mulfab ones and mine are very similar- only a few detail differences in material and manufacturing methods, both use a clamp around the leaf spring to control the panhard rod. The SSL version replaces the U bolt plate on one side- it works , but means that for cars fitted with the fuel pump behind the drivers seat, that a cranked panhard bar must be fitted which in my opinion isn't the most elegant engineering solution
