I'm switching over from a cog belt to a serpentine belt system on my 250 blower and the spacers that sit between the tensioner/idler bracket and front of the manifold are a different size for a cog system than they are for a serpentine system. If you've got a B&M 250 blower using a serpentine system and it's not to much trouble...can you please measure the length of one of the spacers for me. Thanks, mark