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1975 240D, W115 Center speaker replacement

I'm trying to find out if this BOSS speaker would be a suitable replacement.

$135 on ebay is sorta steep...

do you know the dimensions? look on ebay on dimensions. Some are a bit smaller so you need to fabricate a bracket or adaptor plate to fit.

I sent a request for mounting dimensions but haven't heard anything back yet. Basically 6.75X2.75 by 7.25 Diag.
Its an odd size...

Here’s an alternative - Upgrading Stereo/Speakers in '74 240D (w115)

Sixto
98 E320s sedan and wagon
02 C320 wagon