how does one get part numbers?

[teahead]

I contacted this manufacturer of front coil springs:

http://coilsprings.com/classic.aspx

and they wanted to know the original MB part number for my 70 280SL.

Is this it?

1083210304

[Baybear]

You can get part numbers by subscribing to the Electronic Parts Catalog.
https://epc.startekinfo.com/epc/subscribe.jsp or here's a free one:
mbepc.net
If you have standard suspension the part # should be 1133210404.
Will

[teahead]

You can get part numbers by subscribing to the Electronic Parts Catalog.
https://epc.startekinfo.com/epc/subscribe.jsp or here's a free one:
mbepc.net
If you have standard suspension the part # should be 1133210404.
Will

Is that for all W113s?  Or is that 250SL-specific (from what I can google)?

[Shvegel]

I had an EPC subscription and let it lapse.  Now I use this.  Since we have virtually the same car this link is all set up:

https://partsouq.com/en/catalog/genuine/vehicle?c=Mercedes-Benz&ssd=%24%2AKwGlkYCk4cKp6s3Epce--P3pyc7Qoa6jorC2uf_W6rLhtKux7Oz--vWzqrWnoKD-9Oi1urPj9LSrsezs_vr9s6q10LO_7KOytayzpq_es7_str-1rLOhtesAAAAAl7aqGg%24&vid=494&q=

According to that the correct part# is A1133210404

If you feel like your front end is diving too much that is an inherent problem:

https://www.slmarket.com/custom-springs-for-your-mercedes-benz/

If you are really a glutton for punishment:

https://www.sl113.org/forums/index.php?topic=77.25