You will need to find out of the wagon and sedan are the same. I would think they would be since they are 123 chassis, but I realise wagons have the hydro rear suspension. If you find they are the same then 77 to 85 will work. I bought one at a junk yard for $50 with the hub and they torched it off for me.

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1959 Gravely LI, 1963 Gravely L8, 1973 Gravely C12
1982 380SL
1978 450 SEL 6.9 euro restoration at 63% and climbing
1987 300 D
2005 CDI European Delivery
2006 CDI Handed down to daughter
2007 GL CDI. Wifes