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The part number was 912A411. It is supposed to fit 3.73 ratios and higher, but for the 1031 rear end it also fits the 3.54 ratio.
This link shows the 912A411 part number as being a Volvo application only. I don't know why. Contact a supplier for more information.
Just remember that you can't re-use the tone ring from a Volvo non-LSD carrier because the diameter is too small. You have to order the tone ring from the Volvo parts book for the Volvo LSD. This tone ring is slightly larger OD and ID, and comes with a shim to install under the speedometer pick up. Without the shim, the speedo pickup would touch the tone ring.
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