If your top and bottom rails are Vintage Lantern, that means you would want to use Vintage Lantern [infill kits](https://www.diyhomecenter.com/trex/transcend-accessory-infill-kit), which come with the gaskets needed to mount the rails to the posts. Those gaskets will be the same color as the infill kit. So yes, you are correct - you'll want to get Vintage Lantern infill kits/gaskets to match the Vintage Lantern top & bottom rails.