I was thinking about buyin one of those place racing crossmembers, but then it came to my mind that should i use place racing mounts with the crossmember or can i use other mounts like hasport?

 

Well the place racing mounts use 4 mounts and hasport only uses 3 mounts. So if you went with the hasport mounts they would have nothing to do with the front cross member because the haspot mounts do even use that front mount. So you will be ok.