product sold without limitation of liability I have sold seat belt extenders to…

product sold without limitation of liability
I have sold seat belt extenders to several people in different states. I am selling these extenders to people who have XYZ cars, where seat belt extenders are not supplied by the XYZ auto manufacturer.I don’t manufacture the extenders, but get them from other auto dealer parts departments, as I have found they ”fit” the XYZ cars.
I have a hold harmless agreemnet signed and witnessed from each purchaser, which says that i’m not reponsible for any injury or damage resulting from the use of the extender. It goes on to say the undersigned (purchaser) assumes all risk.
I did not supply a warranty limitaion statement at the time of sale.
My questions are:
!). Can I be held responsible for injury/loss if the extender contributes to an injury/loss?
2). Would a warranty limitation statement Seat belt extenders are provided ”AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER EXPESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. protect me?
Might any other statements protect me from liabilty?
3). What might I do about the several sales already made?
Possibly a letter of product recall with refund or a registered letter containing the above warranty disclaimer.

Vehicle In February, I sold a vehicle to a friend and only recieved half payment.

Vehicle
In February, I sold a vehicle to a friend and only recieved half payment. I have spent the last few months attempting to get the truck back. Last week it was seized in a raid. My name is still on the title because I was still owed money. The buyer signed my vehicle over to Jasper County after it was impounded. No one asked to see a bill of sale and they took a drug dealer’s word that he had purchased the truck even though it was not in his name. They now want me to sign the title over so that they may re-sell the truck.