I found them...thanks for the heads up!
Yikes...a bit pricey, but it's worth it
1. MBX-6 T8 1900KV, RX8 ON 4S
2. MBX-5T 1520, MMM ON 5S
3. MBX-5 ONROAD CONVERSION 1515, MMM ON 5S
4. MRX-3 ON ROAD CONVERSION 1512, MMM ON 6S
5. TEN T 2650 T8, MMP ON 3S
Magman, i've did exactly the same thing than you on my MBX5T, i've mount the brake servo on the mudguard just next to the steering servo, and i've mount it so close to the steering servo that the gear/arm side of the brake servo can touch the carbon fiber steering servo tray.
So when i apply the brake, the brake servo don't flex/moove at all, because he touch the carbon tray.