When the spring clamps got popular years ago I ran into this on a customer car. I started using oem fuel line only with the clamps instead. I didnt like how the clamp was expanded so much with the gates hose.
This year though I had a customer order a fuel line kit from Z1. They seemed to have found a larger spring clamp like the oem ones that fits the larger diameter fuel line better. I asked and looked around but never could find any info on them though.