For the pan, there are four basic shapes. The truck has a rear sump with an 8.5' drop, the Camaro has a rear sump with a 5.25 inch drop, and the Corvette has a weird thing with side wings. According to the GM LS1 Engine Kit Installation Guide, there is also a Holden pan P/N 12561541 that has a front sump.

This installation guide is really helpful and is available from Chebby under part number 88959384.

The pans are structural and people DO weld on them to change the shape. The filter mounts onto the pan.....kinda strange.

mike in tucson