- Part number
- 12521707284
- Formatting variants
- 12 52 1 707 284, 12.52.1.707.284, 1 707 284
- Brand
- BMW
- Type
- C101 engine harness connector housing (20-pin, body side)
- System category
- Electrical Connectors & Housings
- Model references
- E30, E28, E24, E32, E34
12 52 1 707 284 is the 20-pin round housing of the BMW C101 connector - the large plug on the bulkhead that joins the engine wiring harness to the body loom on the E30, E28, E24, E32 and E34 from 09/1986. This is the body-harness half. BMW has ended production, and used originals are scarce and often brittle. We make a new housing in engineering nylon, designed to take the original BMW female terminals and rubber grommet, so you can move your terminals across instead of cutting and splicing the loom. Supplied as the housing only.
How we reproduce it
- 01
Reverse-engineer
We rebuild geometry from your original - broken samples are fine.
- 02
Design & improve
Weak features get thicker walls, ribs and fillets in CAD.
- 03
Manufacture
Produced in the right process and material for how the part is used.
Volume pricing: the unit price drops as you add units.
Price excl. VAT and shipping
For higher quantities, just request a quote below.
What to send for a quote
- •Multi-angle photos, including both mating faces
- •Rough dimensions in mm (calipers or ruler)
- •The part number if visible
- •Where it fits on the car
- •Quantity required
- •Deadline, if any
- •Tell us the quantity you need - we will confirm whether the part is viable as a single piece or requires a minimum batch.
Frequently asked questions
Is this the round 20-pin C101 or the square 19-pin one?
The round 20-pin housing fitted from 09/1986. Earlier cars with the square 19-pin C101 use a different connector - check the shape of your plug before ordering.
Which half of the C101 is this?
The body-harness (vehicle) side. The mating engine-side housing is 12 52 1 707 283.
Are terminals included?
No - the housing only. You can move your existing terminals across; new BMW terminals are 61 13 1 376 202 to 206, depending on wire size.
How long does it take to ship?
Each part is made to order and dispatched within 10-15 working days of your order.
Do you supply the CAD files?
File ownership is agreed per project - tell us in the RFQ if you need the model as a deliverable.
Do you keep my design on file for reorders?
Yes, with your consent - reorders then skip straight to production.
Is my project kept confidential?
Always. We don't resell or share a client's parts unless the client explicitly authorises it; NDAs available.
Do you ship outside the EU?
Yes - UK and US shipments go out with full customs documentation.
How do I start?
Send photos, rough dimensions and the vehicle details through the contact form; we usually respond within a few working days.
How does pricing work for a single part versus a series?
Engineering is quoted once; production is quoted per unit and falls with quantity. For parts that need tooling or long machine set-ups there is a minimum quantity for the job to be viable, and we state it clearly in the quote rather than after you have ordered.
Your project stays yours.
Every part we reverse-engineer and produce is confidential and exclusive to the client. We do not resell, share or reproduce a client's parts for anyone else unless the client explicitly authorises it. NDAs available on request.
Related
Part numbers, vehicle names and model designations are manufacturer references used only to identify components. Replique Labs is an independent manufacturer and is not affiliated with, sponsored by or endorsed by any vehicle manufacturer.
Your project stays yours. Every part we reverse-engineer and produce is confidential and exclusive to the client. We do not resell, share or reproduce a client's parts for anyone else unless the client explicitly authorises it. NDAs available on request. Part numbers, vehicle names and model designations are manufacturer references used only to identify components. Replique Labs is an independent manufacturer and is not affiliated with, sponsored by or endorsed by any vehicle manufacturer.