Without knowing just what starters you have ,all I can offer is that GM stock type used the offset bolt pattern for the 168t and straight bolt pattern for the 153t flywheel/flexplates.
You likely have dual pattern starter like the one shown that does fit both
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This type dual pattern just shift's the starter toward or away from the f/w-f/p and doesn't use the offset/straight bolt pattern for the change.
http://www.gmpartsdirect.com/performance_parts/store/catalog/Product.jhtmlPRODID=6&CATID=4.html
You likely have dual pattern starter like the one shown that does fit both
This type dual pattern just shift's the starter toward or away from the f/w-f/p and doesn't use the offset/straight bolt pattern for the change.
http://www.gmpartsdirect.com/performance_parts/store/catalog/Product.jhtmlPRODID=6&CATID=4.html
