I ran into this exact same issue while doing the conversion on my car. I used the 30mm z32 aluminum calipers with ss z32 hoses. You have the 30mm iron calipers, if that pic is of your exact caliper. I just brought one of my calipers and ss hoses to the parts dept at the dealership I work for, and they gave me two 3 inch straight hardlines. I cut off about 3/4 of an inch off of those hardlines, and re-flared them. I then wrapped them in mechanics wire so I could bend them without collapsing. I put two 90 degree bends in them, and they work perfectly. You simply thread the hardline fitting into brake hose, and then the other fitting into the caliper.I assume that you got those pics from
http://importnut.net/300zxbrakeswap.htm
If you'd like to see a pic of my finished product, email me through my sig.