300/440/550 flywheel cover question

i recently bought a 1991 js440 with a 550 reed conversion. the 550 had no flywheel cover on it when i bought it. i dont know much about the different parts of these skis yet so bare with me. he said it had a pjs viper case, im assuming that is the block? anyways, i found a flywheel cover online and was told it should fit. i tried to put it on yesterday and the cover is too small. the bolt holes on the case are 1/2 further distance than the cover. i have pics. does anyone have any idea what cover i would need?
 

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