I dont know shit about 180's, but... When i replaced my seals on my diff, the axle stubs didnt seem to look right when seated. They looked like your last photo. The shield didnt seem to protect much, but the stub was inserted as far as it would go. After putting a minimum of 200 miles on my car since then, no problems so far w/ leakage. I would presume that as long as your stubs all have the same girth at the seal, everything would be ok in that area. I would see which axle,
(s13/j30) would have the adequate fitment per length.


Just my 2 cents