Great topic. We use to source most of our filters from eParts until they were absorbed by SMH. I was also told that eParts was started by SMH to compete with Helmar. My beef with Helmar is that they will sell to an end user and their website includes pricing without a log in. I have been very happy with Helmars offerings but freight is an issue since we are so far south. Flight Systems is great, but we are mostly doing IC repairs.
Helmar and SMH are all I know of that we have left. I have been very happy with SMH- especially X Parts.
Steve