I have checked all old coupons and price is $39.99 for Upgraded Metal Parts Set for Wltoys 144001 144010 124017 124019 (in Banggood). Go down and check coupons out. Remember to check price history if it is available. You probably want to know what is the best price?
Upgraded Metal Parts Set Swing Arm Steering Cup Rear Wheel Seat for Wltoys 144001 144010 124017 124019 1/12 RC Car Vehicles Model – Red
Latest coupon and price update (UTC):
Banggood ($39.99)
Banggood warehouse is located in China. Low/high price? Awesome! This price is the best in CouponsFromChina database! There is one great coupon!
Link: Banggood product page
Price without coupon: $40.99
1. ($39.99): BG288868
this code has to be applied in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
This is the best price ever noted in my database!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGa6daed, BG8FORMULAMX
(these codes were not working in latest coupon update, but you can check them out anyway)
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Check out price history chart (for all/most countries) for Upgraded Metal Parts Set for Wltoys 144001 144010 124017 124019.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).