Toyota has only two different steel rims in 16x6,5, the one on the picture above with the mentioned part number and another one with a lot of round holes around (42601-60620), similar to FJCruiser steelies.
http://www.toyodiy.com/parts/p_G_2006_TOYOTA_LAND%20CRUISER_HZJ105R-GCMRS_4103.html...
All the 7 series doors are the same, except of the ones coming from a vehicle with foldable windscreen frame (73, 74, 75 Pickup/Ute).
The difference is in the upper front corner.
If your 75 is a troopie you can use the 78 doors without any modification.
Hi Grease Cruiser,
I own a HJ 61 with a rotten body. I had the idea to cut the body behind the front seats and to build a box like a camper shell behind it. Part of the idea was to increase the wheelbase by using 79 springs like you did. You wrote about an extension of 8,5 ", I think it is...