In-Line Tube: crap customer service?

Ive got an issue with in-line tube. I BOUGHT a 5/16 fuel line for a 73 Dart. I usually make them, however, I wanted the Auto 1 kids to install the "factory" line. Anyway....the line broke during the install.

Where the line goes around the frame rail in the RR wheelwell, the saddle bend had and internal clearance of 2", the frame rail measure 2 1/2 wide. When the kids pushed up the line, it snapped at the bend. Inline told me their lines don't break with 1 or 2 bend cycles...this one did!

Inline told me all their lines are correct; and that 2" clearance is correct. They told me I had too much undercoating, that was the problem. The rail is 2 1/2" wide, trust me. Is it only my car on the planet with 2 1/2" wide frame rails?

In-line told me they would sell me another line with a 20% discount, but it would be bent the same way (wrong). So I asked for a refund, they told me NO. I told them that they would be losing a customer for life over this.....the manager "mark" said...."Thats fine". wow.....great customer service....

1) what is the correct frame rail width?
2) any else run into this problem?

BTW: In my opinion.....NOT very helpful people at Inline tube, bend your own lines....