Now if you can come up with an easy way to replace them. Maybe a tool that unclips the stock D1S bulb.
I don't believe a tool is necessary to remove them. If they are anything like the 14-15 model of Optima, then I know what you mean about that darn stubborn clip not wanting to come off to remove the bulb. Just takes some patience to get it off, but definitely should be able to be done by hand.
how much do you sell these bulbs for? and how difficult is it to replace the stock bulbs?
All pricing information is right on our site depending on where you are located. We offer free shipping within the US and you can view pricing options by clicking the link in the top of the first post. Installation difficulty will be based on your level of experience as each customer will have different experience when it comes to working on their vehicle. We always recommend professional installation.