The electrolytic caps can be in several diff types of packages so that might be one issue with finding a lot with the same Uf values and the same voltage ratings? The 3 most often seen are the Radial, Axial and Can Capacitor. Generally you don't see Can capacitors in SS amps but were quite common in the vintage tube amps. The Radial caps with the two long wire leads coming from one end would be most common to use in more modern amps with smaller printed circuit boards (pcb). The Axial type with one wire coming out of each end are found more often in amps with older and bigger pcbs where there is more room on the board for the caps to lay down. I am a fan of Nichicon, Spraque, Mallory, Panasonic.....just about any electrolytic caps made in the US or Japan.
Regarding the non-polarized capacitors used for coupling gain stages together, commonly referred to as tone caps. I don't know what the orange and green ones would be without seeing them. But the different brands can be found as the predominant "tone" caps in different amp manufaturer's products. Generally speaking, the less expensive the amp, the less picky the manufacturer is about the brand/quality of the parts they use. People who build the much higher priced amps are trying for the best product possible and they buy the tone caps they believe sound best in their amplifier. I don't remember most of the better tone cap maker's names right off my head, but you can always buy a few different kinds in small amounts and see which ones sound best to you. I would say go to a website dedicated to offering the best amp materials and peruse the diff capacitors they sell. (try Antique Electronic Supply, Tube Depot and EL34 World which all carry quality parts)
Big word of caution: Electrolytic capacitors work like batteries storing energy so the amp doesn't warble in and out when the circuit calls for more power. But depending on what type of electrolyte material used in the capacitor, all of them eventually dry out and no longer hold the energy. So, that said, don't buy "vintage" electro caps because they can be no good right out of the box.
