Help replacing surround speaker

So I noticed that one of the front speakers on my Denon Home theatre (of around 9 years age) has stopped working.

Have moved the speakers around and the fault follows the speaker.

So its a 5.1 system with 4 x identical Denon SC-A56 speakers for the 'corners' and its one of these that has croaked.

On the back of the speaker it says:

Impedance 6 Ohms

Maximum Input 30W (IEC) 100W (Peak).

I cannot find any second hand units, so figure I am going to have to replace at least 2 of them - I guess you would want to 'balance' them.

The specs for the Amp say :

Front:

75W + 75W (8 ohms, 20 Hz - 20khz)

110W + 110W (6 ohms)

I am not terribly clued up on audio but I know they dont have their own power source so will be 'passive' speakers.

Its not worth spending too much and I found surplustronics have a few - I thought this looked like a possibility:

https://www.surplustronics.co.nz/products/5477-stereo-background-speakers-2-way-525-inch

Am I ok to go with 8 ohms , 35W RMS and Peak of 70W ?

Any practical advice much appreciated