I assume you meant the 1015 (not 1050, since I can't find anything numbered 1050).
Personally, I have always used the 1023. However, looking at one mounted under one of my engines, the back of the coupler box still doesn't reach the truck axle, so a 1015, which is shorter, should work just fine.
I can't say how the coupler height will work. The 1023 works very nicely with just a .010" or .020" shim between it and the bottom of the tender.