[mickmate]

As Mark (MAStuart) says they all vary. Dimensions are all off the frame so if you start with good frame rails it's all doable. On the 289 frames and plans I have seen issues with lower control arm holes which raise hell with leaf spring geometry. That is why I make a lot of adjustable or comp style lowers for bent originals or replicas with incorrectly located mounts. Fortunately for 289 builders we have a lot more options on spring length or even adjustable trunnions. Other common issues are frame width anomalies that don't jive with original tank sizes, leaf spring channel mount heights that translate into diff mounting issues. If you have paid the money for an original style diff you pay again in sweat getting it to fit in there. We have some creative solutions there too with Jag pumpkins actually fitting even though we're told they won't.