First step is to start by determining which series of 17 you have. The first two series were all original persian orange except rear rims were silver. Many of these have been repainted with the later orange and some even with the orange and cream colors.
I think you might have to take paint code to auto parts store and have the paint mixed to get original persion orange. It is Dupont std 81-8444 according winter 99 issue of Old Allis News
Series 3 and 4 were Persian orange 2 with cream wheels (rear rims still silver). Persion orange#2 is Dupont Std 112-8300. It would be safe to get the cream from an Allis dealer.
It said these Dupont numbers are for an old formulation and had to be converted by the Dupont dealer.
If you don't know what series you have start by giving us the serial number and someone can look it up. If yours has round muffler and headlight by the grill it is probably a series 1 or 2. If it has oval muffler, headlights on the rear fenders it should be a series 3 or 4.