I have a factory Infinity head unit without nav. I am looking to give the Alpine DPR-RDS1 wired modulator a try. There is one other forum member who has installed one of these, but hasn't signed on since last year, so I doubt I will be able to get a hold of him.

Here is the link where he vaguely outlines the install:

https://www.crossfireforum.org/forum/467423-post1.html

He referenced two adapters he needed:

12040VW21 Motorola/Female to Volk/Male Antenna Adapter
12040VW12 Motorola/Male to Volk/Female Antenna Adapter

These totaled right around $20.00 together. After doing some research, I discovered he must be a resident of Canada, as Crutchfields only offers these on their Canadian website. I just got off the phone with Crutchfields US and was pitched two adapters totaling $40.00.

Antenna Adapter Works with select 1999-up vehicles (Motorola male to OEM antenna female) at Crutchfield.com
Antenna Adapter Works with select 1999-up vehicles (OEM male to Motorola antenna female) at Crutchfield.com

I really would like to avoid paying $40.00 for the adapters, so I need some help. Please advise. Thanks!