Hello
I'm not sure if its of use but I have a 215 caldina factory torsen rear diff centre hemisphere that I'm sure is a t series and it,s IRS , happy to let it go for 300 but you will have to find out if it fits or be the test pilot, has the same looking 4 bolt axel stubs as a sa 63 .
I bought it to be a f series which it was not and when I measured it up was 6.7 in.
Dave
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