Tox,
My brother owns a sign shop. The best thing that you could do if you want it to look good is find a small, local sign shop. Make the arrangements with them to look at your boat. They can then match you boat with letters/numbers that look like they came on the boat. My brother matched my gold stripe on my PT175 (I have an green/gold 98 anniversary edition) with nearly exact reflective numbers. If you find a small guy, he'll probably only charge you about $10 and even install them.