Summit probably isn't your best bet for parts for this car. Most of us use RockAuto.com these days. It can sometimes be a little hazardous finding parts for these cars, as the naming structure isn't terribly clear ("GL" was used on many body styles, with overlapping years), but '88 and '89 are the easiest, here in the US. But when you can, look for measurements and verify them. Also, in 88, yours should be an EA82, which is usually listed as an OHC engine, (EA81 was OHV, but is a different body style with very few parts directly interchangeable).