a system for assembling vehicle components includes a die assembly securing first and second vehicle components having first and second apertures , respectively . the die assembly positions the first and second vehicle components with the first and second apertures overlapping , and at least one of the first and second vehicle components including a polymeric material . the system further includes a joining component extending through the first and second apertures . the die assembly supports the joining component , and the joining component including a support shank and a moldable body at least partially encasing the support shank . the system also includes a punch member selectively engaging and deforming the moldable body of the joining component . the die assembly guides the moldable body into engagement with the first and second vehicle components , and the die assembly locates the support shank within at least one of the first and second apertures .