Some times when looking for parts the people sell them only understand them under one name even though they have what you are looking for. Here is the definition of under drive pulley
an underdrive pulley is considered to be an accessory pulley that is larger than the stock pulley
So a larger pulley may be considered an underdrive pulley to them.
79-93MUSTANGPULLEY
I hope this helps
an underdrive pulley is considered to be an accessory pulley that is larger than the stock pulley
So a larger pulley may be considered an underdrive pulley to them.
79-93MUSTANGPULLEY
I hope this helps
thx for the link they dont have it tho