JBtek 8 Channel DC 5V Relay Module Cover (Amazon Relay, 6mm shorter than SaintSmart)
thingiverse
I've modified the length between the holes (front to back) in the original version https://www.thingiverse.com/thing:336948/apps/print/#apps, resulting in a nice snugged fit. Thanks to clough42. Still need to move the screw holes a bit to the edge (on the high side) for perfect alignment, but you can still have access to the screws. Please bare with me. I'm taking this as a challenge to learn Blender.
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