For club sprints / Level 2 speed events, you should technically require a cams compliant cage. WRX club has been lenient in the past on this requirement as I've seen all kinds of bolt in, and non compliant designs pass scrutineering. From Jan 1 2013, the requirement will be to have padding in contact bars for all competition levels. Again, it's up to the club scrutineers on the day to enforce it.
SCHEDULE J - SAFETY CAGE STRUCTURES - were safety cage is required
From 1st Jan 2013 ALL competitions will require minimum SFI 45.1 or the preferred FIA 8857-2001 roll cage padding
11. PROTECTIVE PADDING
11.1 Helmet and Head Protection:
(a) Where the helmet of an occupant could come into contact with the safety cage, protective padding shall befitted in that area, which complies with:
(i) International competition and below, FIA standard 8857-2001, type A (see FIA Technical List No 23 “RollCage Padding Homologated by the FIA”); or
(ii) For national competitions and lower, SFI specification 45.1.
(b) Implementation DatesPadding of the type specified in 11.1(a) is required as follows:
• Any FIA category vehicle (eg, Group N, Super 2000) – refer FIA Appendix J, Article 253 – currently in place;
• National competitions – from 1 January 2012; and
• All competitions – from 1 January 2013. The use of the specified padding is highly recommended in the meantime.
11.2 Body Protection:
Where the body of an occupant could come into contact with the safety cage, it isrecommended that flame retardant padding be fitted. FIA standard 8857-2001 or SFI specification 45.1padding is recommended.