I presume this is a motorcycle. Ride to NAPA store in your town ,match with a swatch ,they will mix and can put it in a spray can for you, good luck!
Thin out the paint for color match
PXR is the color code for the paint color of the vehicle. If you take that color code to a auto paint supplier they can match the color exactly. I believe that is a Jeep color code for Brilliant Black Pearl Coat.
Bring in a sample of the RL paint to a Benjamin Moore store where they can eye match your color. If you want to find a comparable Ben moore color, you can visit color-swatches dot com (see the related link) and enter the color you want to match, then there's a "convert to another brand" option
You can try http://www.myperfectcolor.com/Paint-Brand-to-Paint-Brand-Color-Match-Conversion-p/convert.htm but it is a paid service.
a beige or off white color.
Yes, a good painter can match the color.
Orange
Some paint stores can scan an item and create a paint color that is similar or exactly the same. There are some stores that would need a sample or a piece of the item to create the paint color.
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Any good auto paint suppliers will match the colour even if the paint code is missing or the car has been resprayed in the past A good paint suppliers will have colour chips for paint colour identification.
Take a picture of the seats, and go to a paint shop and compare blue color of the seats to the other colors.
If you need more paint then Lowe's should be able to match the color. However there is the possibility that it won't be an exact match.