2013 Toyota Tacoma Roof Rack

I just purchase an after market roof rack for my 2013 Toyota Tacoma. The bracket that goes on the front of the truck doesn't have the LH/RH stamp on it. How do I know where to place those bracket without the LH/RH stamp?

Thanks

 

Welcome to TW! What brand?

 

Mock it up. If the brackets look the same then it probably doesnt matter.

 

The brand is Advancetuning. I got it from EBay. I don't like the washers that came with it. I like the ones that I seen on YouTube videos. They are rubber like sticky type. Where I can find those? Do they have to be sticky?

 

I just went to the hardware store and found rubber washers 5/16 (inner), 3/4 (out) 1/16 (thick), not sticky, but I got contact cement, I guess I can apply a small amount around the rubber for a tied fit seal. What do you guys think? Did I have the right washer and the contact cement idea would work?