MangPong,
Here are some notes from my build book, but first, two pictures: one of the 1989 Isuzu so that we are sure we are talking about the same vehicle, and the other of the upright (the knuckle).
Weights are: 4.0 kg knuckle, 3.75 kg hub, 4.90 kg rotor, 5.60 loaded caliper, 0.40 kg dust shield = 18.65 kg total (ugh)
Lower ball joint is Moog K9453, upper is Moog K9452 and tie rod end is Moog ES2953
Wheel Bearings are inner 'JAPAN LR NSK LN48548' and outer 'JAPAN MR NSK M12848'
Bolt circle is 6 x 5 1/2 inches (137.7mm) which is a common light truck size, but makes wheels hard to find. My truck had 14 inch steel wheels and I replaced them with 15 inch aluminum wheels (7.7 kg plus tire weight)
I did a full set of measurements on the knuckle but the distance you asked for is the distance between the outside faces of the ball-joint mounts: 166 mm, measured along the vertical axis (I did all my measurements with the knuckle at 0 degrees caster). Because the lower ball joint mount is almost as high as the spindle axis it can be challenging getting a low roll centre with this knuckle. I had to change to lower profile tires in order to get my front roll centre down to my (approximately) 65mm target (2 1/2 inches to the North Americans
) BUt I chose this donor because I already owned it ....
Oh, and it is a front-steer knuckle so the usual rack position will work. But you will need to find a rack because the Isuzu Pickup had recirculating ball steering.
Don't forget that Isuzu built some small rear wheel drive passenger cars in the late 1980s and early 90s.
_________________
Warren
Isuzu Pickup/SR20DE, +401 COLD frame
Build Log:
viewtopic.php?f=35&t=11601