Unfortunately I'm away and won't be back home for a week or so but I have a L36 and a L67 torque converter sitting side by side in my shed and I could swear the L67 is slightly larger in diameter. There's also a difference in the turbines in the L67 converter which can easily be seen by the difference in the welds. If no one beats me to it I'll snap a pic and upload it when I get home. There is a slight difference in the flexplates too and I'm pretty sure their weights vary slightly.