I'd figure out what cover that's from and just try to buy a used one with all the studs/breather tube already on the thing. I've tried messing with those studs before and they are a bitch to get them to stay in the diff cover if ever removed. I tried removing the breather tube from my s14 cover a while back and ended up destroying it.
Also that diff cover should have a splash shield type thing for the ring gear on the inside... might not be good if that's missing as well.
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