Technician reported that as part of a crew preparing for jacking the Airbus aircraft; it was discovered that the bolts with the jack pad adapter kit were the incorrect length.

Narrative

I was starting an afternoon overtime shift and was asked by Supervisor on duty to look into a tooling situation that resulted in a fuel leak on Aircraft X. We have 1 Airbus jack pad kit at ZZZ; kit PN XXXXXXXXXXXXX PC # XXXXXX. This kit was checked out on date for use on Aircraft X. I discovered that the kit contained 2 jack pads: 1 for each wing and 6 attach bolts; although only 2 bolts are used on each jack pad. I discovered that 3 of the bolts were approximately 2.5 inches in length and the remaining 3 were 2 inches in length. The jack pad identified for the left hand side had 2 of the 2.5 inch bolts secured in the transport holes of the adapter while the right hand side jack pad had 2 of the 2 inch bolts secured in the transport holes. In reviewing the Aircraft Maintenance manual it appears that the hardware included in the kit is not what originally came with the kit. The Aircraft Maintenance manual drawing depicts a fastener with a cable or wire strap that secures it to the pad and appears to have a special shape to the barrel of the bolt.It appears that a Technician installed the pad using the longer hardware supplied in the kit that damaged the dome nut resulting in the fuel leak.