
I also saw the gold axles recently but didn't want to just buy one set of fronts or rears, but I discovered crunchy had both sets...so I made him an offer and picked those up, too.
The long C-carriers require swapping the Optima front arms over to Kyosho Maxxum front arms.
I found that the Trinity gold kingpins were a hair too tight in the Cross carriers, so the holes had to be filed out a bit with a rat-tail file or the wheels wouldn't turn smoothly.
Swapping to the Maxxum arms requires some additional modding so that the front stabilizer can be reinstalled; I had to bend a custom stabilizer wire...the same width in the middle with about a 37 - 38 degree angle bend up from horizontal on both sides, then I bent the ends perpendicular to the middle part, measured precisely so they'd slot into the Maxxum arms' stabilizer mounting posts. I had to do the same mod for my Barney car so I knew what to expect. It's not often I get to use my high school protractor...who knew that thing would come in handy?

Not much to say about the rear gold axles; just swapped 'em in for the stock black steel axles. You can't really see them but I just think it's cool that they're gold to match the rest of the car.

I took care of some details that were nagging at me, like replacing the nasty white AE shock collars with some black ones.
I still have more plans for the Zebra Midas Optima...I'll swap out the fugly grey pot-metal front knuckles and rear hubs for some black aluminum units. I have a modern ESC to replace that blue LRP unit because the blue is bugging my eyes. I also plan to buy and paint a new wing that better suits my original in-your-face 80's paint job.