Not sure if this is similar to what you are looking for. Stainless Works made my resonator tips to my specifications concerning the overall length and angle of the tip. Their workman ship is first class and well worth the price.
http://www.stainlessworks.net/...or-exhaust-tips.html
Most resonator bodies are 3.5" o.d. with a 2.25" i.d. core. These are 3" o.d. and 2.5" core.
Richard O.
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.