Smokedog, just for info, the part that you need is 31-2831-16. Pinball Spare Parts Australia has it in stock. (they also have the 03-9255-5 spacer). This is the contents of the "goodie Bag":

2072 ..3 A-21793 unique parts bag-50059 1
2073 ...4 23-6694-10 "black rubber ring 2 1/2""" 2
2074 ...4 23-6694-6 "black rubber ring 1""" 2
2075 ...4 23-6694-8 "black rubber ring 1 1/2""" 1
2076 ...4 23-6694-9 "black rubber ring 2""" 1
2077 ...4 23-6694-5 "black rubber ring 3/4""" 1
2078 ...4 23-6695 flipper ring-1 1/2 id black 2
2079 ...4 A-21805-16 plfd plastic assy-50059 1
2080 ....5 31-2831-16 plfd plastic-clear 50059 1
2081 ....5 03-9255-5 spacer #8 x .733 1
2082 ...4 A-21805-17 plfd plastic assy-50059 1
2083 ....5 31-2831-2A plfd plastic-clear 50059 1
2084 ....5 03-9255-5 spacer #8 x .733 1
2085 ....5 03-8044-9 post mini-tr red 1
2086 ....5 4106-01114-08 tcs #6X1/2 pl-hwh t-17 1
2087 ...4 20-8842 envelope 3 x 5-1/2 1
2088 ...4 4008-01113-24 ms 8-32x1-1/2 pl-hwh 2

Wally