The may be dumb question, but as long it is the same body style, could you fit it in. The made that style for about 10+ years, rught.

For example, the 126 was made from 81 to 91. Wouldn';t an 85 500 SEL engine fit in any of them?

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'89 420 SEL
'90 300 SEL
'68 Olds 88 Convertible
'84 300 SD (sold it)