Mike, first off, wheel sizes were not an option, you only got the wheel size that was standard with the package ordered. So if you have an RS, without a wheel option you received 14x6 rims in steel/dog dish caps. If you ordered Rally wheels on your RS, you received 14x6 rallys. If you had drums, you got a rally that fit a drum brake, if you ordered discs, you got one to fit discs.
The YJs that you are asking about came only when the SS package was ordered. So looking for dated YJs for your car (that would not be correct anyways) is not ideal.
Also, early 69 dated Factory 14x7 YJs (I assume you mean Jan/Feb/March 1969), are highly sought after for pace cars, so they are rare and pricey.
What you should really be looking for are XG rims, which are Rally wheels for Disc brakes 14x6 Base (which will be correct for your RS). And they should be more reasonably priced
The tire that most closely matches F70-14 is the 215/70R14, which can be mounted on a 14x6 or 14x7 rim, so you will end up with the same tire and rally wheel look you are going for and will fit your discs. Luck on the hunt!
PS, if you look at my 69 vert (Jinx) photo link below, you will see 215/70R14 tires mounted on 14x6 XN (drum only) rims. And you would be hard pressed to see a difference between them and an expensive 14x7 YJ rims