No connection with the seller, but this is $100 off the best price I've seen lately:
https://www.ebay.com/itm/154692657985?mkevt=1&mkpid=0&emsid=e11021.m43.l3160&mkcid=7&ch=osgood&euid=295826934c4d4412884ac67f10e15a0d&bu=43193832364&ut=RU&exe=99322&ext=234173&osub=-1%7E1&crd=20211110065650&segname=11021&sojTags=ch%3Dch%2Cbu%3Dbu%2Cut%3Dut%2Cnqt%3Dnqt%2Cnqc%3Dnqc%2Cmdbreftime%3Dmdbreftime%2Ces%3Des%2Cec%3Dec%2Cexe%3Dexe%2Cext%3Dext%2Cexe%3Dexe%2Cext%3Dext%2Cosub%3Dosub%2Ccrd%3Dcrd%2Csegname%3Dsegname%2Cchnl%3Dmkcid
Good chance there is only one for sale at that price.
Jim
That's Ian Wood.
Hands down the best diffy guy on the continent.
If he built it it's better than a new one.
Genuinely nice guy and he races a mean vintage Volvo.
The Fine Print.
"This unit has 3/8 ring gear bolt holes, some newer units may have 7/16 or 1/2. You would have to drill out the holes to the size required for your vehicle. Check your parts and this unit carefully before drilling. "
Easier than making up spacer sleeves. I'd be careful to check the spline count on the side gears.
This unit will fit in both the Dana 44 case and the Salisbury used in the Jag IRS.
Jim
I checked and they don't have the 19 spline side gears. (Jag IRS)
Jim