Actually the SE didn't arrive until '90 & the Interstate didn't come along until '91 when the original model became the Aspencade. There was only one Model in '88 & '89 - Gl1500.Does it have reverse? It not: Interstate.
The owners manual has GL1500, se & Aspencade, also GL1500 SE / GL1500 A. Could all these models have the same carbies on them?