Rear wiper rubber seal

[Penal33QV]

I have the rubber seal from the rear wiper borken for a while, i repaired it with sealant but it´s not working for much time.
I been searching for this part and it´s a bit hard to find, i need the rubber seal and the plastic cap that covers it form a 89 s2 33.
Have any of you had this problem, water is getting in and when i open de boot all the water acumulated in the plastic cover of the wiper motor wets my luggage