Information may no longer be required due to date of the above post but, without an actual model number for the machine, it isn't possible to look up information. The best I can provide is a link to Jacks Small Engines website for Bolens, which has multiple models and years to pick from.
Other reading indicates Bolens is made by MTD, so a similar model MTD may give you a clue.
https://www.jackssmallengines.com/jacks-parts-lookup/manufacturer/bolens
