You'll be looking for a 8900 series shock.
Any Reputable Suspension house can get them for you or call Penske Directly
150 Franklin Street
PO Box 1056
Reading ,PA 19602
(610) 375 6180
(610) 375 6190
2499 South Stockton Street
Lodi, CA 95240
(209) 368 5040
(209) 368 5119
Tell them what you are and what you race how much you weigh and you skill level Novice, intermrdiat, Expert. They will spring the shock and set it correctly for you on their shock Dyno, and make any changes you may need free, for a reasonable time.
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