early Liteace E series diff

i have an early Liteace E series rear diff. this has the 7.1" diameter crown wheel (ring gear to some) so its smaller then the more common F series 7.5" one hich also went into later taragos and maybe the previa

I'm chasing a limited slip or locker type diff centre for the E series

Toyota/TRD used to list one, but I'm told its been obsolete for years

The same size gears were used in a few coronas and cressidas in the 1980's

any help or leads appreciated

thanks