Heller is probably a K2 (sold as 1972 in USA). I never owned that kit. But I had a Nagano CB750 that was definitely a K1. The smaller rounder side covers are K1 or K2 as are a flat seat. The photo of the Heller that I saw had ruby diamonds on the side cover which is a K1, not K2 (had yellow diamonds). But chrome fork ears are K2. Just research the bikes well and I'm sure you will make it correct.
Some people called hubcaps poverty caps. I guess because they couldn't afford the upgrade. Except in the case of the 1963 Corvette. You got wheel covers when you couldn't afford the upgrade. Apparently a restored Kelsey-Hayes aluminum knock-off set restored gets $9500 today. LOL
If you do print the instruments from google image consider this; Almost every Honda 750 instrument is a one year only part. The K0 and K1 gages had idiot lights in the gages, but K0s had black faces and iridescent numbers and higher redline (8500-9300). The Heller kit versus MPC had gages with no idiot lights. They were between the handlebar bolts. Check many images for gages as many bikes are incorrectly restored using the wrong parts. They fit, but are not correct.
mark, I thought there were 2 1964 Cadillac kits; $1.98 kit with steerable wheels and custom parts and a 98 cent kit with non steerable wheels and no custom parts. I figured the USA Oldies came from the 98 cent kit.
The upper triple tree holds the tachometer and the speedometer. They are attached to the triple tree quarter circles. In real life, a chrome band encircles what the triple tree does not.. Speedo on the left, tach on the right. Speedo cable drops on the right side of the wheel to the center hub.
Good commentary Casey. You took the words out of my mouth. Anybody ever get the tail lights to fit the '69 Rambler Scrambler? I couldn't and if I ever did, they would be incorrect. Typical AMT, MPC and Johan to have a one interior tub fits all; convertible tub used for hardtops as well. Saves money and back then the picky builders didn't exist. The only exception I can think of is the 1961 Impala 4dr had a unique interior tub. But it was not available in a kit. Johan Promos (1964+ it seems) had bench seats but the kits had buckets. I'm not too crazy about the Caddy buckets in the 1964 and 1968 Oldies kits. The Plymouths were the same when they were new promos/kits. But we can't cry too much. USA Oldies kits, as flawed as they are, are a great starting point for a model project.
I don't think the QC dept of Johan existed from the 70s on. I remember picking up multiples of the Johan 71-72 Eldorado only to find broken rear bumpers. Sometimes the USA Oldies kits had missing parts too. At Woolworths they were cheap, so I just bought another.