I bought about a dozen aluminum sealing rings for the Haldex unit at BelMetric.com.
Item “GA8x12”. 8mm ID 12mm OD
https://www.belmetric.com/aluminum-g...et-p-5620.html
Also the gear oil drain/fill plug has a little green o-ring on it. I bought a bag of 22.1mm x 1.6mm o-rings and found they fit perfectly. I got them here.
https://www.oringsandmore.com/metric...inimum-25-pcs/