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Here is wlgarde's project where he drilled the "Green" holes in his 1976 Sport 15'.
http://www.whalercentral.com/userphot...lbum_id=64

You want to drill the lowest holes you can in your transom.
The Red is standard if your 1985 can be drilled using them.
If not see if the Yellow holes will work. If not, then the Green will for sure.
Measure the new holes twice inside and out before drilling.