I'm willing to bet it is steel, especially from around that time.
Try to find a forum that caters to your type of bike, and ask if any of them have an extra kickstart. I find that the specific bike community forums always have someone who has everything.
2008 BMW K1200S
2003 Z1000 - For Sale
1979 KZ650B - Work in progress
2005 Ducati SS 1000DS - sold :'(
1994 VFR750 Interceptor - sold
1984 VF700F Interceptor - sold
2004 Hyosung GV250 - sold