and ## headings only

• Avoid horizontal rules and separators
• Use pure HTML <table> syntax for all tables
• Follow the exact output structure: Page Title → Part Overview → Key Parameters → Substitute Part Grouping Explanation → Parameter Comparison → Engineering Selection Recommendations → FAQ
• Ensure SEO-friendly content with full part numbers and category keywords
• No concluding statements, calls to action, or sales language
• Ready for direct paste into web Markdown editor

Please provide the input parameters for the main part and substitute parts, and I'll generate the reference page.