One thing to note is that the cars offered on Driver Level Rewards are based on a few factors:
- Your current Collector Tier
- What and how many cars you currently own.
The RSR is a "Red Tier" (I forget the number) car, so it'll only show up when you're at the stage where other cars of that Tier are being awarded to you. If you already own many of the cars at this Tier, then the chances of the RSR showing up are increased.
Additionally, if you hold on to your Driver Level Rewards and don't redeem them, the cars for each Reward are "reserved" and won't be offered in future Reward slots until you have decided if you're going to take them when you eventually go to Redeem Rewards. Eventually, if you keep earning Driver Level rewards but don't redeem them, the RSR will show up.