The wing was strengthened and shortened.
The person who can tell you all about the different versions is Mike Clewes from Apache Aviation
(
www.apacheproducts.co.uk). If you e-mail them, Mike is very likely to assist. He is very helpful.
The Pennzoil cowl is 8 1/2" tall and 6 1/4" wide. Firewall to nose ring is approximately 6 3/4"
This is from the Apache Pennzoil Chipmunk (N13Y)
Hope this helps
Ari