Terms of use
These terms cover your use of InterchangeHQ, a lookup service for Redline interchange codes operated by Redline Used Auto Parts. By using the site you agree to them.
What the service is
InterchangeHQ returns the Redline interchange code for a part on a given vehicle, together with the other vehicles grouped under that code, and lets you search by OEM part number. It is a research aid for auto dismantlers, parts professionals and car enthusiasts. It is not a shop: nothing is sold, reserved, quoted or shipped here.
Fair use
- Each visitor gets 3 free searches, counted per IP address. After that, searching needs the Unlimited plan described below. Lookups are also limited to 60 per hour from one source so the service stays available to everyone.
- You may use results in your own day-to-day decisions, quotes and stock checks.
- Please do not scrape the catalogue wholesale, mirror the site, or resell the dataset as your own. The codes and the matching logic are our own work.
Unlimited plan
- Price and renewal. The Unlimited plan costs $10 USD per year (€10 per year for buyers in Europe). It is charged when you subscribe and renews automatically every year until you cancel.
- Access. Your plan is tied to the email you pay with. You sign in with a one-time link sent to that email, on any device.
- Cancelling. You can cancel any time with "Cancel subscription" while signed in. Unlimited access ends immediately when you cancel. No refund is given for the rest of the period, except as stated for buyers in Europe below.
- Buyers in Europe. If you buy from the European Union, the European Economic Area, the UK or Switzerland, you may cancel within 14 days of payment for a full refund. No ban applies to a cancellation made within those 14 days.
- Early cancellation. Outside the European 14-day window, cancelling within 4 months of payment may result in a permanent ban of your IP address from InterchangeHQ.
- Failed renewals. If a renewal payment cannot be collected, access ends.
See also our Refund policy and Cookie policy.
Your submissions
When you send an OEM number, a fit report or a missing-vehicle request, it is stored as pending and reviewed before publication. You confirm the information is accurate to the best of your knowledge, and you must hold the right to share it — do not submit material you are not allowed to pass on. We may publish a correction under the code it relates to, and we may decline anything we cannot verify.
No warranty, and limits
Results are provided as a guide, without warranty of any kind, to the fullest extent the law allows. We do not promise that a code, a match or an OEM number is complete, current or correct for your vehicle. You are responsible for confirming fitment before you buy, sell or fit a part. We are not liable for loss arising from reliance on the site, including cost, downtime, damaged parts or missed jobs.
Other sites and changes
Links to Redline Used Auto Parts, InventoryHQ, HotlineHQ and Engines Bay lead to separate services we do not control, and their own terms apply. We can change or withdraw any part of InterchangeHQ at any time, and these terms with it — this page carries the version in force.