The diff code is F292.
This breaks down to:
F = 7.5 inch crown wheel
29 = 4.100 ratio
2 = 2 pinion, non-LSD
Obviously you can get them them second hand from wrecked Cressida's.
Beware that the smaller E series diff (8.0 inch crown wheel) is common (double check the plate says E or F, it is easy for dirt to make it hard to read).
Also beware that ratios can be 4.100, 3.909 or 3.727 .
In the US for the 1983 model year, the Cressida could be an MX62 wagon with solid axle or an MX63 sedan with IRS.
The crown wheels can be swapped (as long as both are F series crown wheels) but the housings are completely different would require a transmission shop to do the transfer.
Beware that most MX62 wagons will have the smaller E diff, which won't work for you.
Supra's and some Celica's from the same year had the F series diff as IRS.
Check the ratio before you buy - must be F292 (non-LSD) or F294 (LSD) unless you want a different ratio (which affects your speedo).
Another source of F series diffs is brand new from almost any 4WD shop.
The F series diff was used in the front of the 4WD Toyota Pickup and some models of the Land Cruiser.
This will be expensive but you get your choice of ratio and LSD.