I have a 15 foot 1974 Seawirl tri-hull and was curious about installing a mount for my kicker motor on my transom. I was noticing wildly different prices and wondering if there was one that people thought was high quality but still a good deal. The Evinrude dealer here in town has a non-adjustable aluminum one that is $380 and I thought that was really high so I told him I was finding them online for about $100 and he said that those will be junk. Any thoughts? Thank you.