Spark Module Location

[Fargophil]

Im trying to get my WCM Sprint car running again after several years of non use.
I recently moved and in the process the spark module, the smal black module with the wire coming out of it came loose from its mounting location. Its been so long since I used the car I cannot remember where the module is supposed to be mounted. I know it has to be grounded but I cant see any open unused screw holes where it formally was attatched. As they say a picture is worth a thousand words.
Thanks.