seating

Hi all, have a 89 sr5 dual cab lux and want to replace the front seats without any modifications eg welding, drilling holes etc, Was looking at either a set of SR5 seats out of later model eg up to 97 V6 SR5 as they have the side bolstering etc or a set out of a ssr hilux surf similiar to recaro's. Would these bolt traight in and where in Sydney would be a place to start looking, have rang a couple of wreckers but they dont have any and said they usually dont. The old seats are still in good nick material wise but the padding has not much support left and I find my back starting to ache after driving long distances. Also any idea on would be a realistic price for some thing like these. Regards Steve M