That is a more reasonable price than I was expecting for such a specialist bottom bracket. I bought this M-Wave bottom bracket to fit into a Carlton road bike that has damaged threads, its the type that screws into itself rather than the bottom bracket of the frame so is universal with italian frames as well as damaged threads etc and was quite impressed with construction for a very reasonable price.Fat bikes aren't my thing but one assumes that is a 120mm BB, I thought most FB BB's were 100mm but tht certainly isn't. 120mm isn't common.
The actual shell looks to be 120mm so I would think you need a 120mm SQR JIS BB and a square taper crank set. Don't take my word for it, you will need a second or third opinion.
The bits you are measuring look to be the remains or parts of an old BB they need removing /unscrewing to leave a clean shell.
M-WAVE SEALED BOTTOM BRACKET CARTRIDGE FOR FAT BIKES -100/120mm - FAST UK STOCK | eBay
Housing width - 100mm / 120mm. M-wave Fat Bike Bottom Bracket. Colour - Silver. Right side of housing to end axle - 25.5mm / 28.7mm ( +2.5mm spacer). Axle length - 159.5mm / 179.5mm.www.ebay.co.uk
The bottom bracket I linked to was just for standard bikes not fat bikes but just an indication of how competitively priced M-Wave products can be and yet they seem decently well made. I think it was 113mm or 115mm the one I got, something like that and that was the full axle length. Sounds like the bottom bracket you need is going to have a total length of 150-170mm for the axle length if the middle shell bit is 120mm on its own.
