That won't work, because although there are 2 different distributors with different rotors, the same cap will work with both.
If you buy a factory Mopar distributor cap, it will come with both rotors. Use the one you need and toss the other.
I would make a semi-educated guess and say the 177. The 169 (almost $40) is more than twice the price of the 177. I used to have a 96, and the cap didn't cost no $40.