Like my new seat?

[71chevylowrider]

I sold my nice bench seat with the highbacks today, I went to put in one of my 2 stock (68 & 72) bench seats & not only do they not clear my amp& Cd changer, the bolt holes don't line up, so now I'm screwed, it never occured to me that the holes in the cab with welded on nuts from the bottom weren't in the stock locations, so now I have a brand new cheyenne seat cover with the scroll design, & 2 seats that I can't use. Can anyone tell me what the heck is going on? can you tell by these pic's if the welded bolts are stock or added on by the po? I thought they were stock since there is 4 mounting holes on each side (8 total) The front bolt holes are 50 5/8" wide, the rears are about 49 5/8" & from front to back the holes are 15" apart. Will a 88-94 seat bolt in? I don't have a welder so I'm looking for a seat that bolts right in.Any help/info would be greatly appreciated as now I'm screwed & the truck is undriveable without a seat.