Hi,
I've converted 8 PS1 cars to 2 rail in the past. I had to make/lower the bolster and it was a mild pain in the butt that I found unecessary for other brands. The spacer would go unused in this situation. Twenty bucks for a 2 rail conversion kit interests me depending on how the kit bolster looks. Is there a photo of 2 rail kit somewhere? They are nice cars and 20 bucks would probably be worth it. Having the holes for the 2 rail couplers already there is pretty priceless, and long overdue. A big plus for Lionel in my view.