Is this 12v Battery suitable?

based on this, i'd have to say maybe:

gel-vs-agm-batteries

 

Yes... If it fits in that spot it will actually be better quality than the ones auto shops sell because its more amp hours than those. Lots of us use these types of 55amp mobility / power supply batteris because they are abundant and near 1/3 the price.

 

What happens here is these type of UB batteries universal batteries that are used in alarms and buildings and so on and so forth are not rated for the vibration and what have you for mobile duty that doesn't matter to me either I use them too but I'm just saying that's where one of the things that goes on with these or that doesn't go on with these this may be a thing for some people I don't know I haven't had any problems with them I've run a few of them in motorcycles which the vibration would be a whole heck of a lot more than a car and then on top of that they're gel so even if they vibrate their cases loose The gel is pretty much not going anywhere then when it does you hose it off pull the battery out throw it away and drop in another one. But yes that should work no problem

 

Connection to the posts will be tricky. Did you come up with that stack, trying to roughly replicate the spec'd battery post diameter? The stock cable clamps will only be contacting the corners of the nut and bolt. I wonder if there might be some sort of bolt-on post that replicates the skinny JIS "pencil" posts.

 

Keep in mind it would require some jerry rigging of the connectors.

Your battery is about 230mm x 138mm x 211 mm

the S46B24R AGM is 9" x 4.75" x 7.75" (230mm x 121mm x 196mm)

You may be able to squeeze it in, but it's very likely the floor cover plate will no longer fit correctly.

You'll end up with jerry rigged connectors and an improperly fitting floor, which could lead to small objects falling down into the battery area. Would hate to see something metallic slip in there. I've seen a (+) battery post get shorted to a car body and the wrench welded itself in position until it melted open like a fuse. Sparks and fire for everyone.

 

There is also the possibility of permanent retinal damage from looking at an arc like that. My sister and I both have blind spots in one eye from having observed electrical arcs. For her it was a failed heating element in a kitchen oven, for me it was a piece of equipment that shorted out at work. It only takes a fraction of a second for the damage to occur. Believe me, your eyes will snap shut very fast when that intense light hits - but just not fast enough.