Hardin Marine Big Block Spark Plug Wires

paid $90 last year but decided to go with remote mounted coil packs, looking to get $70 plus shipping.

Will take them if they work on 525 mercury

I think these should work from a length standpoint, looks like 525 had coils mounted in a similar spot as distributors. Do you know what the coil ends look like?

525efi or 525sci?

525 efi blue motor

I think your coils have a different boot style.