Hi David,
This guy seems to have an almost unlimited supply of reproduction Tiltite caps without the logo. I have some NOS Tiltite caps but would I need to cut the bottom off of mine to make my reproduction Rebat and I just can't do it. I bought these since I will be painting them orange. Also a lot less money:
30 40 50s Aircraft Race Car Anti Spill Tiltite Style Battery Caps Autolite | eBay