UPS Shipping Module for Oversized Products when Shipping

I have looked on forums as well as google searches and unable to find a way for UPS to calculate for oversized packages. Example: I sell a fender which weighs 25 lbs with measurements of: 92" long x 20" tall x 7" wide. UPS requires this item to be charged oversize figure since the size is over their limit. When I go thru the check out it shows $17.66 for UPS Ground from our location in Kentucky to Beaver Dam, KY but when I key it into our UPS system to create the label it shows $40.29 for shipment.

How can I fix this issue? I do not like having to call a customer up to inform them that they shipment will cost nearly $25 more to ship also most of our customers are all email based customers.

Hope someone can help.

Thank You,

This is a great question. Id like to know if something has been put into place in 1.5.1 to handle this as well?

Thanks

Perhaps this company might be interested in doing this for zencart:

http://www.webshopapps.com/us/dimensional-shipping.html

This is for a magento cart... don't know how hard it would be to transliterate to zencart! We sure do need this functionality, and have for years!