Oops, sorry I didn't.
May I know why you wanna to reduce both sizes ?

there's no anti roll bar at the rear of the avanza, im not sure if you mistaken it as the panhard rod.
the front anti roll bar if not mistaken , original is 17mm.
why do you want to reduce the anti roll bar size, u might want to increase it not decrease it consider that the Avanza body roll is quite severe.

There's knocking sound only when turning either left or right regardless of speed. Any idea what is the issue here?

Negative or positive camber ?
Last December I did -15'  camber at both front tyres and it was a big improvement in cornering compared to prior alignment which I speculate to be a positive camber.
Left Front toe-in was +7' and RF was +5'. With hands off the steering wheel, the car drifts and veers to the left slightly.
Nice and steady straight ahead driving but 6 months later now I find turning right requires more effort to steer than turning left. Suspecting front toes too high?
What's your front toes?
Unfortunately I didn't have camber and toes for Rear which may help to explain car drifts left problem with hands off the steering wheel.
Do you have yours ? If yes, what are the numbers.

This is Gabriel shock absorber. It measures 22" fully extended and 1 7/8" wide on the absorber (not the top cover). Fully extended and fully compressed same with APM performax. Not sure about other absorber although the APM performax is thinner and softer.

update. just visited turbineman page https://turbinemanlog.blogspot.com/2014/08/...about-rear.html
From his website I conclude the diameter of the gabriel (yellow shock absorber) almost / the same as KYB Ultra from Indonesia. The RS Ultra locally made mentioned is not so big in diameter compared to the KYB Ultra from Indonesia FYI

Yesterday had to send car back to workshop after about 2 mths installed lower arm and front stabiliser bush. Suspect bolting loosen after lower arm or bush seated properly.

Today longer run to test it, but yesterday short run feel more solid. At corner to the right some time hears like metal sound " Tak Tak Tak"....

With tyres off the ground, rocking the tyre(s) forth and back with hands at:
a )3 o'clock and 9 o'clock postions, slight play or looseness means tie rod ends has problem;
b )6 o'clock and 12 o'clock position, slight play or looseness means Lower (for Avanza)/Upper Control arms ball joints has problem.

Then u worry drive shaft ko....hahahah... I prefer rwd.....less headache

I prefer the Avanza 2022 better then Veloz. Gut feel should be in range of 80k to 88k

?? why? The original seems good enough. What is your problem on the brake system?

You using rotor that is not good and possible brake pads too. Also, tyres what brand n model u using? absorbers looked like RS ultra?

All these contribute to braking power.

Rotor have many qualities, last time when I change my hilux, I personally seen the good and low quality type aftermarket. I seen Taiwan and Japan made. The Japan made was better, brand is called SHOJI.

SHOJI Shopee

Also, suggest you service the piston at brake caliper, looking real dirty at the piston. Think your pad creating too much dust.

I just notice Kayaba RS Ultra not available for new Avanza F651 2012 onwards.
Not sure kayaba updated info or not. I check shopee none.
What good shocks for new avanza?

But ori disc also solid all, 😅😅😅

How long does a brake shoe last?  Usually how many KM have to change?