Mine has the black o-rings on the bottom, as for black vs orange I am not sure of the differences and did not notice any thing different (it seals against the block directly). an o-ring is an o-ring.I'm going to do this repair to my 2014 next week. I've bought Mopar 68105583AF that was manufactured in 2018. It has the black o-rings on bottom. I think that I read that the orange o-rings were superior because of the extra spacing nubbins on the inside diameter. Is this correct? Would you run the black or get the orange o-rings?
for coolant brand, it won't matter, the only thing that matters is DO NOT mix HOAT and OAT coolants (they will gel up and cause more issues), I am currently using standard green 50/50 etho glycerol, yes I will have to change it slightly more often but I can deal with that if it means less B$ then if I were to use the OAT/HOAT stuff.I will be doing my 2013 shortly. When doing this can the coolant be changed out to a less costly brand?