belt tensoiner pulley

i just bought one for my 98gt i had to get one that fits a cobra that bolts on with 3 nuts instead of the one for the gt which had 1 bolt in the center is this odd or not :shrug: thx

not sure what you did but GT and Cobra use the same 3 bolt belt tensioner from 1996 to 1999 then in 2000 Ford went to a 1 bolt tensioner. so either someone has swap engines in your car or swapped-out the front cover.