EastBear are reasonable looking too.
http://www.rhdjapan.com/east-bear-led-tail-light-set-r33-skyline-2-door-51703
Been thinking about doing some custom ones down the line for my 4 door.
But then it would just be a Ham pizza....
Which Nismo exhaust do you have? 33 may fit but it's longer so not sure if it will line up close enough to the hangers.
making a stencil is pretty easy, get someone to load the vector up and print it to the correct size, , mark it up on some manila folder material etc, cut it out with a sharp blade, stick it over and spray it.
I wouldn't be worried about the thermostat, you're talking 5degrees difference between the neo and earlier thermostat opening temps and the Neo is designed to run hotter so you're probably better off leaving it.
Top one is det neo, bottom one is NA, looks like you have the r33 intake manifold etc on your Neo engine. It should be fine running all the S2 electronics though probably not as efficiently as it would on the NEO ecu due to differences in the head design.