Spider flew apart in my backup sled ('10 M8) that my kids ride. Need to replace the entire primary due to damage. Did cat fix the primary in the proclimb model years? I see a poll in the M forum with very high failure rate in the '10/'11 model years (something over 40% failure rate). If I replace the primary what model year should I be looking for (assuming Cat fixed the problem)? Any information would be appreciated. Thanks.