I have a 1993 Gary Fisher Advance Mountain Bike. It came with a Shimano Hyperdrive-C crankset (Shimano Altus C10, 28/38/48 teeth). I need to replace the middle chain-ring (38T). It is mounted with 5 bolts. Can someone please point me to a source (pref. product/part page link) where I can order this chain-ring?
BTW: Is there a heavier-duty version of this chain-ring avail.?
Here's a pic of the crankset on my GF: