Yes you can with no issues. I have some cheap LED Arrows I got at WalMart years ago and I just wired them in parallel. You may want to install some small disconnects as the mirrors often come off for maintenance. You are going to tether these new mirrors right?
I Installed mirrors from China that had the turn signal arrows in the mirror. Wired by splicing into circuit and they worked beautifully. The problem I had was they mirrors themselves were so loose they would not stay adjusted. The day I left to head to California to do my coast to coast IBA run I adjusted one mirror so many times it finally fell off and bounced down the freeway. Duct tape fixed it but after I got home I bought another brand without the turn signals and they work great.
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