Having a hard time finding replacement bolts and nuts for this crossmember. Is there anywhere I can go that has these I checked the Z1 and a few other places

If Z1 can't order those bolts then it's probably not sold as a dealership item. Unfortunately some things like that are hard to get so I recommend you look around various pick-n-pull lots to find a vehicle to take them from.

Bring a shovel, a service jack, and jackstands and make damned sure you have them solidly placed if it's on dirt. Check beforehand though, sometimes those lots will just lift the vehicle with their forklift and set it on a rack if it's a slow day for them.

Use infinitipartsdeal.com for reference. I believe the part number for the assembly is 544B2-AM900, but double check for your vehicle to be sure. The bolt for most of the holes looks to be part #11298-CD100. The website states that a total of six is required. The other two holes, if I remember correctly, should fit over the studs that hold the compression rod.

The parts are listed under: Body (Front, Roof & Floor) / Member & Fitting.

For what its worth, i attempted to take out all these bolts on my v36 and it seemed to be all generic m8 bolts.

They have a different corrosion resistant coating but other than that are basically the same.

The nuts were really hard to find. I think they were m10 by 1.50 all the hardware stores in automotive stores around here had 2.0.

The bolts are found at home Depot they match up good. Order the nuts online

They're called "coarse thread" nuts. If you are not using corrosion resistant hardware you can always apply some kind of petroleum product (vaseline) to the threads when installing them as well as spraying them with zinc "cold galvanizing" spray on anything that's exposed. That will provide similar corrosion protection. Of course you will have grey spots under your car from the cold galv but that's usually not an issue unless it's a show car.