I am selling a lot of 25 TWENTY FIVE suction cups, size 1 3/4 inches diameter.  Each cup requires about a 3/8" hole (plus or minus 1/16" inch).  These came from whelen, code3, SVP, and federal signal dash and deck lights.  Removed due to permanent mounting these lights.  I am also including a more permanent mounting solution if the light is too heavy (no other seller includes this).  This system consists of a double sided plastic panel sized to the suction cup flat against the windshield.  You peel off the film on one side of the plastic, push firmly to the suction cup on the light, then take out to your car, remove the film on the other side, then stick to your windshield.  Hold for a few seconds, and your light is tightly attached to the windshield; you will need a heat gun or blow torch to heat the adhesive to get the light off the windshield.  Very strong adhesive and your light won't move.  You will only need this if you constantly park in hot sun or you are using a heavy metal light that the suction cups cannot support. I have never found anyone else selling a similar item.  As a free gift, I am including about 8 to 10 of these adhesive panels with the purchase of 25 suction cups.  A single suction cup sells for $4 to $7 each depending on size, I used to sell these for $4 each plus shipping, now bulk price to sell out my stock.  I am also offering free shipping in the USA.  Thanks for checking my listing!